Oh that's an interesting question... I think his reaction can roughly be split into two categories:

This is a mild inconvenience to me and I will keep fighting regardless, status ailments in this category are: freeze, burn, shock, forget, confuse and possibly dizzy.

Please let me never experience this again that was the most terrifying experience of my life: sleep, fear, rage, despair and brainwash.

Yes he is more terrified of experiencing a human emotion than he is the feeling of being on fire for a period of time. Yeah he is totally fine why do you ask.

HELP it really says a lot about SEES when the most normal person there is the 10 year old who watched his mother die in an hour that most people don't know exists and also planned the murder of the person who killed his mom 😭😭

Yuna: THOSE ARE THEIR HOOVES YOU BITCH

HELPPP SO CANON ACTUALLY 😭

But mitsuru's hair looks less red than before

You get to have social links with the male party members and Ryoji (Junpei's social link is one of the best), you get to choose your Velvet Room attendant, you get to save Shinjiro, you get two fan favorite characters, Saori and Rio, Yukari misgenders femc and Fuuka misgenders Theo, every female party member and Elizabeth have a bisexual awakening because of femc

And then in FES the Answer gives us AMAZING character development for Yukari Aigis and Mitsuru plus it introduces an underrated character that Atlus has ignored ever since in Metis

So why not have both. Baffling.

Yeah it is kinda like crazy that they could literally make everyone happy by just combining portable and fes into this upcoming remake and add the new stuff they want to add but ig that's just not what they wanted to do 😫

Reading that article and the ign one it seems that they're really bent on remaking the persona 3 experience as opposed to like idk make a definitive edition to the game (which is what most p3 fans want). There's not really much we can say there because I suppose from like an "artistic" point of view so to speak they chose to bring the original p3 experience (well fes' journey) to newer audiences. As I said before there's absolutely nothing wrong with that HOWEVER I do think that adding the extra content from fes and portable would have served that goal way better than just... remaking p3. As you said both the answer and portable add much more dimension to the story and characters of p3 so by essentially ignoring that not only are you doing the game a disservice (im like 90% sure portable is canon and 100% sure the answer is canon) but it's also gonna confuse new fans when we start talking about Metis or Erebus or idk what actually happened in the final battle of p3.