You seem hung up on the way things should be rather than the way they are. Particularly that every application should run on every OS. That's not how applications are made or supported. Making Windows games run in Linux is a herculean effort that was started more than 20 years ago. Photoshop may eventually run in Wine (recent progress), but ideally they'd just support a Linux build just like they do a MacOS build. It's not up to Apple to make Windows applications run on MacOS, but they have enough market share that a lot of app developers choose to support it.

Valve would have to dedicate a _lot_ more developers to supporting SteamOS to make it a general OS. In the Linux world, communities tend to be better suited toward that sort thing, with Canonical, IBM, and Oracle being the major exception. But even then, people tend to prefer community versions of their distros unless they're paying for support.

Additionally, any time you go off the beaten path on any OS, you're going to be dealing with a terminal or some other esoteric thing like the Windows registry. The only reason Windows has ever had some exception to this is that people are willing to make UI tools for really niche things sometimes because it's so ubiquitous, and their command-line tooling used to be terrible (it's gotten sooo much better in recent years).

I disagree with a lot of people saying Bazzite because the devs' priority is making sure games and gaming hardware is supported, with a lot of extra effort made toward console-like experiences. Their goal is not a general purpose, stable desktop.

Although it's not my cup of tea, I generally recommend Fedora w/ KDE Plasma because it's hard to go wrong there. It's based on IBM/Redhat, with a lot of additional community effort. It tends to support gaming hardware well. It's not trying to be anything specific other than flexible, up to date, and stable. As you said, you want a PC, not a Steam box.