So, why does Butter Roll want to dispose of it? well their mission is to make the ultimate cookie (or as is also told: beast cookies) and that dough 98, despite breathing, is a failure (which did hit Matcha hard as she is also considered a failure). As its being thrown out, Matcha asks if the disposal is connected to the sewers, which Butter Roll answers by saying that the disposed go into wasteland, adding on how they may be evil, but they sort of their trash. Matcha would then go away from the others, its hinted that she took some life powder from them after she left, she doesn't get caught since they believe its natural for life powder to "return to the earth" as Licorice puts it.
Now in the next cutscene, we are shown Matcha in the sewers, having her own place with her own equipment to make dough and whatnot. You see, the reason why she wanted to eavesdrop and go with butter roll is because she wants to make the perfect dough for the beast cookies/ultimate cookie. Why does she want to succeed in making the perfect dough before the rest, so they can prove to them that she is in fact better than them!!!
the segment has her just mumble about how they will be furious when her tea leaf seeds in the dough and make the beast cookies that way, it also has a bit where she talks to her many planted tea leaves, asking why she was created
now i made a cut of the video (sadly cant u so you can watch her dialogue since there's a lot, but i believe that this dialogue can tell you just how focused they are on mod making Matcha, Matcha.
As their 99th batch shows promise, now knowing the ratio from the 98th dough, they celebrate as they put the dough in the beaker for safe keeping, so they can make beast cookies! When Poison Mushroom notices Matcha in distress, the ask if Matcha is ok, only foe her to loudly say no.
Butter Roll (still optimistic) tells her not to damage the lab equipment (as she seems to be tempering with them). She goes on to say that they dont deserve to be happy, only for Licorice to say that he knew all along that Matcha wasnt in for the research
But Butter Roll still thinks she is after her missing ingredient (even when told its not true)
As they restrain Matcha Cookie, he would throw the dough into the baker, letting it how rise before further tempering with it, everybody is relieved that the dough is now secure. Matcha comments on how if they succeed in making the beast cookies, they can make the ultimate cookie, to which Licorice says the the lab is open at al times and that it would the next logical step.
With her plans now ruined, she mumbles about being ignored yet again, shunned, never to be recognized or noticed, everything down the chute (yes, she says this), so in the last dich effort to be noticed, she summons her tea leaf seeds and attacks the equipment, causing explosions.
Everyone is now panicking, as one of the beakers that kept life powder is had cracks, risking the powder getting into batch 100, Butter Roll batches it easly, until Matcha decided to go for the mixer, highly sensitive machine that exploded by just one tea least seed. Its even worse by the fact that batch 100 was in there, and now its gone.
Now with the lab ruined, batch 100 is gone and the whole ceiling was destroyed along side their research Matcha celebrates as she sees that finally they are paying attention to her
Butter Roll and Pomegranate discuss the conditions of the beaker and dough 99, lucky DE casted a spell on the beaker beforehand, so batch 99 is safe and sound. Unfortunately tho, some equipment broke, including the breaker that contained Life powder, which would mean that they have to recollect it.
they decided to keep this disaster a secret from DE, for them and Matcha cookie. As Macha continues to celebrate, Butter Roll does comment on how he didn't know she had that kind of power in her, he was kind of impressed, Pommy agree she has potential, but as she says, however wasted.
and the cutscene ends with the members and scientists cleaning up and recovering any working equipment, while Matcha still celebrates.
But the story doesnt end here, it ends when they shwo you were batch 100 ended up at:
This is Batch 100, also known as Mycookie that you control in the town square mode of the game, Gingerbrave and the gang saw it fall from the sky like a shooting star, and end up being surprised that its a baby.
this baby would be later on used to promote MyCookie be having Cream Ferret raise the baby when they came out.
and that's it for the story, if you do feel like my retelling is lacking, you can always turn to youtube for it, its how i watched it:
Cookie Run Kingdom Story - The Laboratorium - YouTube
Now that i gave you context on Kingom's Matcha appearance and the lab story, i think it says itself as to why i and you don't exactly like Matcha's current direction, it feels very devoid of her.
i will most likely comment on other things you brought up, but its 11pm currently and there's a chance that i mite fall asleep, so yeah