I'll name you 10:
Street Fighter 6,
Star Wars Squadrons,
Star Wars jedi survivor,
Persona 3 Reloaded,
Prince of Persia: The Lost Crown,
Like A Dragon Gaiden - The Man Who Erased His Name
Avatar: Frontiers of Pandora
Persona 5 Tactica
Dragon's Dogma 2
Assassins Creed Mirage
Yeah, the Xbox app sucks, it's slow and get stuck all the time. They have been at this for 3x years now, developing Windows native app, why in the hell can't their 1st party app just not be semi broken on their own platform.
While pc can play old games, you can sometimes run into compatibility issues. Especially games in the ps1/2/3 era.
Og Xbox and xbox 360 games work without much issues on Xbox one and series XS. Ps4 and Xbox one games are 99% playable on Series XS and Ps5.