On the system requirements angle, PC gamers generally don't care anymore, however, MS can certify a few standard tiers, say, 'xbox 2026', 'xbox 2026 premium', 'xbox 2026 ultra' and the software and hardware ecosystem follows those.
Microsoft tried to do something like that before with the Windows Experience Index in WinSAT. It didn't last long: the GUI was displayed only from Windows Vista through the first release of Windows 8.
Microsoft can curate a store of games regardless of the nature of the hardware. The app stores choosing to let developers run wild has nothing to do with in-house hardware.
If next to nobody signs up for Microsoft's curated store, this curation will be ineffective. The only thing that encouraged third-party developers to publish through Microsoft's store is that Xbox consoles are cryptographically locked down not to run games from anywhere else.
An xBox Series X equivalent GPU is like $250.
Plus the cost of buying the rest of the computer around it. This can prove more expensive if you want a case that looks more attractive in the living room than a big noisy tower.
Most games that release for xBox release on Steam for PC as well.
I'm curious why it took over 14 years after Red Dead Redemption was released for Xbox 360 for it to get a PC port. Rare Replay and several other respected Xbox One games still haven't been ported.
That's why pairing a game controller with a PC is so popular, and steam big picture mode.
In 2012, the consensus was that most users were unwilling to either build a second PC, cart a gaming PC back and forth between the living room and the computer desk, or run cables through the walls, to use Big Picture mode in Steam. (Source: adolf's comment) When did this change?