Lol, have fun with the metric ton of shit that is the Snap Store and Ubuntu. You'd immediately run into problems doing what you just said, and the performance wouldn't be the same either (assumming similar hardware). Not even mentioning the metric shit-ton of garbage you may run into with Nvidia.
So many enthusiasts don't even realise how much work and knowledge goes into setting something up that works as well as the Gabecube. If you believe it's just "pick random distro and install Steam" you're painfully mistaken.
I myself run CachyOS on my daily driver and have the Gamescope Session installed which they provide, which is as close as you gonna get (as Cachy brings most kernel optimizations, better scheduler yada yada yada) for when I want to game on my TV. But that still led me through the CLI and has some caveats, which is absolutely 100% nothing most gamers want or even have the time to inbetween e.g. family + job.
OP may be out of line with language, but they're right.