It was my impression that part of the point was also to isolate programs from one-another in case one of them is compromised. I may be mistaken in my understanding, but if Qubes OS did that then that is a good reason for me if I could for example isolate Steam and all of the proprietary games from the rest of my computer. Likewise with the isolating the environments that I visit different sites from.
> Steam is best kept on Windows because it would be pretty obvious since *you're connecting to your Steam account and you would lose the privacy from it.
I don't run Windows.
> Linux is also not the best environment for your video card, either, because nVidia doesn't have open-source drivers available. Now, yes, there are drivers available for some version of Linux, but they are generally close-source and very likely not the best for privacy reasons.
Proprietary drivers on Linux are still better than proprietary drivers on an OS that is also proprietary. Besides I plain don't like the Windows experience. I use Windows on my work computer because I have to but I will not use in on my private computers (aside from occasionally in a VM for some purpose or other).
Anyway, a sibling to your comment told me that Qubes OS does not have official GPU support so I guess it's not for me sadly.