Comment by fluoridation

>It’s just the kernel and virtualization stack that are custom.

That "just" is doing a lot of heavy lifting. Maintaining a customized system is hardly zero effort. Speaking for myself, there's no way I'd ever consider something like this, because I know sooner or later a system update is going to do something weird that I'll have to figure out how to fix. I'd rather just buy a second computer just to run those specific games. The other person admits they need a second GPU to support this use case anyway, so it's not even like you're saving that much money.

>Want to tab out of your game and check your email client?

I have a phone, and a tablet, and a laptop (besides the desktop). I'm not exactly hurting for ways to check my messages or look something up quickly.