It's not that hard. In fact, here is a wiki website that explains how to do it easy:
https://emulation.gametechwiki.com/index.php/Apply_ROM_hacks_and_translations. You're telling me sony needs their own dev team to do this, when in reality all they really need to do is just ask permissions to use a tool that probably has a open license. Even then, they can easily build a plug-in for their own emulation that allows for on-the-fly patching. No excuses when this has been the standard for years when it comes to PC/android emulation. Even Nintendo had custom wrappers for the Wii that easily allowed people to inject language patches into custom N64 roms, because of Sin & punishment.
they don't even have to go that far, been a while since I messed with playstation emulation, but iirc pal could still output 60hz if the console supported it (or I'm completely offbase and confuse it with another console, like I said it's been a while).
These are Vtubers being used as advertising mascots. They look boring and extraordinarily unoriginal. I don't know much about Vtubers, but I know these characters couldn't sell me... whatever they're selling. Placid and lame is the last thing you'd want associated with your product, no matter what you're selling.
advertising for what? tbh I don't even know why people brought them up, it's basically just sony jumping onto the vtuber train after they saw it makes mad dosh, but in typcial sony fashion way too late when the market is already crowded. almost all vtubers are advertising themselves, no one is gonna buy a sony bodypillow, they buy shit with their waifu on it (there are some like the crunchyroll one or some special nip ones representing prefectures etc., but that's the exception and like everything ad related questionable how effective it is. I highly doubt there's a high number of people that base their purchase decision solely on who has the cuter mascot).
Your character design has fundamental flaws if the onus is on the viewer to figure out their personality from a short stock list of them based on eye and hair color. That doesn't make for interesting characters, that just makes for variants of the same few characters over and over and over and over, much like how western entertainment's full of the same bland-ass Mary Sue mixed race girls that are smug and can do no wrong. They are boring characters that subvert no expectations.
as I said implied, it's not an absolute rule. it also means you can literally "subvert expectation" by going against it. and again, the design itself is only a small part of the whole vtuber thing, in the end it doesn't really matter, you can have the most subverting model on the fucking planet and it won't help you if you're not entertaining (which happens often enough in the indie scene). you are also aware that you're judging the character solely on it's looks, right? what should a character look like that you're willing to check it out? what if others do that too if that character is popular? are gonna stop watching now that the design is "mainstream"?
for anime in general, there's still plenty of variety if you look close enough. and like western shit everything has phases, most anime 10 years ago looked the same, just like it looked the same 20 years ago. eastern/western doesn't matter, the statistical dynamics and market forces are roughly the same everywhere. inevitably what's currently popular will decline, then replaced, and the circle continues.
The mainstream is currently dystopian and retarded. Fuck 'em
they always were. mainstream means majority, meaning you need a broad enough appeal and fulfill the mainstream's expectations and demands - anything else and there's a good chance whatever you put out will
not be mainstream. and since the goal is to make money, not subvert expectations, it's pretty easy to see which direction they're going (not to mention after TLJ that shit can fuck right off, since it's synonymous with smug retards shitting out low effort dreck thinking themselves the smartest guy on the planet. subverting expectations is fucking worthless if it ends with a turd in your lap.)
that criticism is literally "why is pop music so fucking shit". maybe because it's fucking pop music?