For all that fight in WxS unit story is important for Tsukasa to remember his feelings, it still affects his relationship with the rest of WxS up until the recent event. And it starts with his perfectionist tendency.
(I think it's obvious from how his favorite catchphrase when he fails to do something is "I fail as a brother/star/chairman/etc.", talk about dramatic lol)
Tsukasa is a perfectionist through and through, and it's not limited to show-related things. Saki's hinamatsuri party must be perfect. The pegasus chocolate statue that he made in White Day event (as ridiculous as it was) was gorgeous enough that Honami thought it was bought. Also, the fact that Tsukasa manages to get good grades even though he's bad at studying just shows that he won't cut corners even with things he's not good at. And while the reason for this perfectionist attitude can be attributed to how a star should be like according to him, it can also be traced back to Tenma siblings' past.
For Tsukasa, Saki's condition could take a turn for the worse in just a night as shown in Dazzling Stage event. Tsukasa most likely had a fear that his attempt to make her smile at his shows would be the last every time he did it. "Every show is a once-in-a-lifetime battle because it may be the audience's first and last time seeing it" is a motto that he passes down to Saki (Saki's newest 3* card). That's why in everything he does, he always does his utmost best. It's a habit that was also born from the trauma of having a sickly sibling, and the fight in the unit story didn't help but exacerbate it.
(Derailing a bit, the EN localization kind of messed up on this part because Tsukasa said "our show" in the original. It's such a minor thing, but this line is important because this means that Tsukasa had not only the audience but also WxS in mind at the time. Because of Nene's carelessness, not only Tsukasa's but also Emu's, Rui's, and Nene's efforts were unrewarded. It was everyone's hard work being wasted. For readers who think that Tsukasa is someone who only think about himself, that "our" was a hint that maybe Tsukasa is more than he seems. Too bad EN decided to change it to "my show".)
Back on topic, at this point, Tsukasa's anger was understandable enough. They failed, he rebuked Nene, and Nene tearfully apologized.
But then he kept grilling Nene.
Tsukasa had said that he lashed out at Nene due to his frustration over their failure, but it was only one of the factors why he was so cruel. Another reason, and probably the biggest one, why he was so relentless was because he put her on that same perfection standard. At that time, Tsukasa already thought of Nene, Emu, and Rui as his equals. That's why in the original there is an indication that Tsukasa paused after Nene admitted it was her fault (the ellipsis was missing in EN version).
In the beginning, he had some reservations about Nene and Nenerobo, but he decided to trust her and her abilities (and by extension Rui) despite his misgivings. That's why he was as mad as he did--because Nene betrayed that trust. Tsukasa trusted Nene to be able to deliver a perfect performance, but she didn't step up to it. His anger was also directed at himself for trusting Nene.
Tsukasa is hard on himself when he doesn't manage to fulfill his own standard, and thus his outburst to Nene can be said to be a mirror of how he would berate himself if he failed like Nene did.
(On another note, Tsukasa was uncharacteristically upset when Saki lied to him in Valentine's Day event, so does Tsukasa have some kind of underlying trust issue?)
When Tsukasa told Nene that it's okay for her to fail... It was him putting up a wall between him and Nene--and the rest of WxS. Sure, it may be a good thing that he didn't put them on the same high standard as him, but it made him double down on himself. Because it was okay for everyone else to fail, he can't fail even once.
Sure, the other members are there to support each other, but Tsukasa most likely takes it personally because he thinks it's his fault that WxS fell apart that one time. As he also claims the leader position, WxS is his responsibility. It's easier for him to blame himself whenever something goes wrong. Wonder Halloween event is a good example, and even Dazzling Stage event had this underlying tone as well by how Tsukasa thought it would be his fault if the show's quality went down, and that it would only trouble the others if he went to practice before he was able to grasp Torpe.
He unconsciously put pressure on himself and made a clear line between him and WxS. If one of them fails, he needs to be able to cover for them as the leader. Although Tsukasa says "failure is okay when you challenge something new" to others, he thinks "a slight failure is unacceptable when I challenge something new".
As Dazzling stage event also shows, it's not that Tsukasa's acting as Torpe in the early chapters was bad... But for Tsukasa and Rui, it's not good enough. And if they're not satisfied with it, so were Emu and Nene. But they kept encouraging him, telling him that if it was Tsukasa he could do it somehow because he was a star that would answer with 12000% of his might. And even though Tsukasa was worried, he assured them it was his role as a star to fulfill those expectations.
All Emu, Rui, and Nene did after giving their own opinions about Torpe was just wait for Tsukasa and believe in him. They never thought to say "it's okay if it's not perfect" to him. The idea that he might not master the role had come up many times, but their belief in Tsukasa was stronger than that worry. For them, Tsukasa could get over any hardships and triumphed at the end.
Nene believed that they could only wait for him, Emu trusted him because he was their super glittering star, and Rui had faith in him as he was their star and chairman. This was something that Tsukasa had built throughout the times they were together, and his effort to regain their trust after that disastrous first show was rewarded beautifully. However, they unconsciously hold Tsukasa to that same perfection standard that he put himself on due to said trust.
Just as Tsukasa trusts himself not to fail, WxS also trust Tsukasa to do the same--and it's both a good and a bad thing.
That absolute trust that WxS towards Tsukasa is amazing, but that's because Tsukasa is always able to fulfill their expectations. Tsukasa himself is also glad that WxS trust him that much and he strives to be able to respond to them. It's not like he can't do it--He's reliable, independent, and a hard worker, and it was these traits that make others easily rely on him.
But if it continues, Tsukasa will never open up to WxS.
Because as 88āå½” puts it, Tsukasa is "a pierrot who never backs down just as everyone expects him to be, so there's no need for others to hold back", and "as long as everyone laughs at that childish trick, he can laugh as well".
Granted, in that song both WxS and Wonderland Sekai VS reassure Tsukasa that they wholeheartedly support him and hint that they would accept him just as he is... it's just that there's no indication that Tsukasa want to rely on WxS on anything other than shows. Sure, everyone is important for him to create the best shows, and he cherishes and trusts WxS as his best companions, but it was just that. He thought that "he needs to be a dependable leader for WxS" and "he already failed once, so he can't fail again". And as long as he has those in mind he won't allow himself to be weak in front of them. For him, WxS are people he needs to be strong for, not his equals. And for him, that's fine. As a future star, he probably thinks it's not a problem nor a burden at all.
However, that's the barrier that Tsukasa created between him and WxS.
And if 88āå½” is any indication, it's a matter of time for Emu, Rui, and Nene to reach out to Tsukasa beyond that wall just as Tsukasa has done for them.
Heavy is the star that holds the baton
