If the other big publisher Ubisoft is able to create Performance and Quality modes for both Xbox Series X and PlayStation 5 why didn't EA do the same?

It seems like they're just making adjustments to the One X and Pro versions (allowing higher upper bounds). Only so much is possible using this basic approach. It likely didn't require much effort or money to do this and it's better than nothing.

The full power of these consoles isn't even available when playing games in backwards compatibility. Actual PS5 and Series X versions would be closer in resolution and framerate.

A more stable 60fps is what I like to hear. I play this on the One X in performance mode and it would feel so much better at a locked 60. I assume Pro owners would like it locked as well and so the PS5 and SX will provide that while also looking better.

Because Xbox has the marketing rights to this game.

This is because it's still a game running in BC mode. This was a simple performance boost patch allowing the new systems to run the game a bit better to the extent of how BC works on both systems which is why the XSX has the better gain from this due to the X1X already running the game at a higher resolution compared to the PS4Pro and not being as restrictive as the PS5 BC mode. Either way though the 60fps improvement is the most important part of this patch which both consoles receive equally.

The game is running in backwards compatible mode, it's not a proper next gen patch. PlayStation seems to have less options available to developers in this scenario. We saw the same with BC titles like Modern Warfare last year and Cyberpunk as well does not as many options on PS5.

I would have preferred a proper next gen patch, it's odd that EA has been so slow to patch their library. How is Apex not updated yet for example..

Agree