"Today, PlayStation revealed that its PS5 has sold 40 million units. Microsoft doesn’t share hardware numbers typically, but court documents, math, and slides from an ID@Xbox in Brazil seem to suggest the Xbox Series X|S line-up is around 20-23 million units sold globally. That essentially puts the PS5 at a 2:1 advantage against Xbox, but perhaps the split is even worse than that beneath the surface. "
It’s for playing a PS4 game vs playing a PS5 game. If you want to play the PS4 version of Street Fighter 6 on a PS5, you can use PS4 controllers. If you want to play the PS5 version of Street Fighter 6 on PS5, you must use PS5 controllers. Basically just arbitrarily forcing you to buy new controllers when the others would have worked fine.