Xbox has backwards compatibility for games all the way back to the original Xbox. Not only is there backwards compatibility, but pretty much all those old games also get HDR support and some of the big ones like Red Dead Redemption and Mass Effect also got 4k textures for 10+ year old games, free of charge (don’t have to buy a remaster, etc)
I have a couple thousand hours of play on Slay the Spire on my iPad. It’s such a perfect game for mobile. I play it on the plane, at night on work trips, been playing it again on vacation this week. Just a fantastic grab-it-and-go gaming experience.