Its a pity that rollback isn't standard for the genre. Max had a whole video on it versus Japanese developers, why he thought they weren't using it, etc.
Yeah, I agree with everything Max said.
Sajam has a really good video summing things up too, but they're making similar points.
I have an article I need to write about Under Night In Birth, I interviewed the director at Evo, and I asked him about rollback netcode. They're hearing the demand in Japan, but at least at French Bread don't have the programming resources.
They need to just look more into licensing GGPO really.