I think a relatively substantial issue with swapping ISA is the software library, which is what's kept Intel in business all these years. Older/retro games is a large part of gaming, and being able to play 15+ year old PC games easily with a single download and no kajoogling is a major 1-up for the Steam Deck, especially when some games have better compatibility under Wine than Windows 11.

The Xbox Series consoles are capable of playing a select portion OG Xbox and Xbox 360 games almost natively, while presumably playing Xbox 360 games via an emulator, but they stopped adding new games to their backwards compatibility program for some god unknown reason despite the fact they were some of the best selling on the platform, but to me it seems like Microsoft wants to shift literally everything to the cloud, starting from Xbox and eventually getting to Windows somewhere down the line, which scares me honestly. Sun said the network is the computer, but I'm sure they meant a network you controlled, not goddamn Microsoft.