The ethics dept said it was for realism sake. The devs say it's for realism sake.
Honestly, you're being naive there. The whole problem as far as I'm concerned is the ethics department weighing in on her breasts and the consequent terrible communication about it. While there's merits in saying that the breasts are more or less in line with artwork and slightly smaller than the in-game battle model (which is why I tried to calm down people about her actual breast size at the announcement), it doesn't really make any sense when talking about a sense of realism. There are tons of things we forego in regards to realism in FF, especially Cloud's sword (your "which is ironically in service to realism for swinging a big sword." makes no sense, because it really doesn't serve realism), because it's fantasy. But "give Tifa a sports bra" to "restrict" her chest is one of the most mental justifications I've seen. "Don't give her jiggling breast" would be the actual thing, while all the talk revolves around stupidity. She's not wearing something that'll really stop her breast from jiggling either, shown by it not restricting that much and that she does moves at crazy speeds. You're really conflating fantasy and realism where it suits you here. Just like some are conflating breast size and design (see Dissidia NT thread).
Also, I do dislike the changes to Barret as well. But the more egregious one on his is the sunglasses. The guy is one of the most emotional ones in the game and they cover his eyes. The belt nonsense (how is removing the metal protecting your gut a better sign of realism than the weird belts?), the shirt they suddenly put on him are bad as well, but those glasses I've whined about since the announcement. Makes no sense in terms of realism either. This kind of weird "realism, but not" thing is just confusing. It's something that would've been easier explained as Nomura redesigns and shouldn't have involved any ethics department weighing in on a character's breasts.
Anyways, Tifa's design is weaker than the original, Barret's design is weaker than the original. The Dissidia NT thread made that very apparent to me at least and made me dislike the redesign more again, after coming to terms with that terrible black undershirt/bra whatever it is.
Nobody is outraged except the people in here harping endlessly about CENSORSHIP and ETHICS DEPT. The other side is literally "get over it" and "it's fine" and "who gives a flying fuck, why is this thread 13 pages long" which would be the opposite of outrage.
See here is where I fundamentally disagree with you. The "get over it" and "it's fine", "who gives a flying fuck" is also the kind of people I disliked in threads where Anna Sarkeesian's critiques were the topic.
The problem in this thread that people are constantly discussing completely different things and they also accept whatever excuse suits them. That's why being principled is of the utmost importance. "Complain about redesign" being a thing to "get over" being applied to all future cases, would that be something everyone that says so would be able to do? Probably not. Same on the other side, those expressing outrage, would they be able to not go "get over it" in a similar future case? probably not. That's where tribal tendencies and convenient outrage shows its face.
Critiquing redesigns, changing of characters, story and combat systems is very much legitimate. Criticising sexualized designs, criticising desexualization of a character, all have merits and are topics to be discussed, whether one's position is for or against. People do however seem to just like these things when it suits them.
If there's no clear attempt at understanding the other part, then a discussion ends up just going on and on. That's more like a debate than a discussion. And it won't go anywhere when people conveniently gives the company all benefits of doubt as the topic suits them.
It's not like anyone's going to cancel their pre-order/not buy the game because of Tifa's and Barret's redesign, but it's a sign of many that the remake might be heading terrible places. It's too bad that redesigns and battle system seems to take up too much of the discussions. There are already far too many concerns, whether character portrayals (Jessie, slightly Aerith), signs of changing up story elements, bad understanding of character relationships, and the overall terrible pacing it'll have and would have to be like 8 episodes in order to not be Midgard frontheavy. Even that won't stop a purchase, but it's definitely something that should temper expectations of someone who played the original.
The topic would've likely died out as long as it hadn't gotten dragged up again. Really, it's the disagreement between two sides that's really keeping it going at all. And that's good, people should discuss something and come with arguments for and against.