Most likely the ease of the BC options for Xbox, look at Overwatch and multiple titles just adding in 120hz modes, PS5 needs a dedicated version that then needs submitting through the full process of a title.
I still play Fighterz all the time. Me and my son go at it every other day. I can never beat this little shit. Getting close though. It’s funny how this game is probably one of my fav games this gen and I’m not too big into fighting games