Every PC I’ve ever tried to repurpose as a gaming console of any sort has had way more jank to it than I’d ever tolerate in a console, in the 25ish years I’ve been hooking computers up to TVs. Even the Bazzite box I’ve got is pretty bad by comparison. Hell, my actual Steam Deck has a lot more undesirable “enthusiast” behavior to it, let’s say, than I’d want out of a Nintendo product for example, even though it’s just about the best I’ve seen (the actual best is Retroarch with a skin mimicking the PS3’s menu, on a dedicated distro that could take it from cold boot to interactive in like three seconds flat even on an rpi2… but that won’t play actual modern PC games, just emulated consoles and such, so it’s not a fair comparison)

A common failure is the controllers. It’s hard to get a combo of OS stack, Bluetooth chip, and controller that Just Works like they do on consoles. Something always needs fiddling-with.

Video or audio out are also often a problem. Glitched audio or audio mode-switching, trouble switching video modes, screwed-up HDR, all kinds of stuff. Maybe fine on your monitor with headphones. Not fine on a TV or projector with 5.1+ audio receiver.

The UIs also bug out or crash more often, and usually aren’t that great at being a TV UI in the first place (even Steam IMO is worse than most consoles, as far as the Big Picture UI)

It also gives devs a stable target with a known market, which is nice for both the devs and the owners of the devices.