Yeah, not everyone wants to build their own PC, and thats fine. But for a couple hundred extra, you could get a prebuilt system thats a better performing machine, is more servicable, and more easily repaired, and better upgradability.
And I don't feel bad, in this case, saying that spending a couple hundred would get you an infinitely superior product here, because we're not talking about limited budgets/best bang for buck builds here. We're talking about a luxury good thats rather form over function.
Ultimately, Its up to you if you want to buy it or not, and I'm not going to give you shit if you do choose to buy it. Just do your research, and understand what you're getting.. because a lot of people think they are gonna be getting an amazing gaming machine, and they really arent, they are getting slightly more powerful steam deck, thats permanently attached to a TV, that wont run most 3d games well without using FSR even at 1080p, especially above 1080p where it probably becomes mandatory.. cause the numbers I've seen, for native 1080p gaming on the steam machine, have been decidedly not impressive for a 700 dollar machine it was meant to be, much less the 1050 dollar machine it is.