The line between a Linux user and a Linux power user is a bit gray, and a bit wide. Most people who install Linux already have more computer literacy than average, and the platform has long encouraged experimentation and construction in a way macOS and Windows generally aren’t designed for. Traditional Linux distributions often ask more of their users as well, requiring at least a passing familiarity with the terminal and the operating system’s internals especially once something inevitably breaks.
In recent years, however, a different design philosophy has been gaining ground. Immutable Linux distributions like Fedora Silverblue, openSUSE MicroOS, and NixOS dramatically reduce the chances an installation behaves erratically by making direct changes to the underlying system either impossible or irrelevant.
SteamOS fits squarely into this category as well. While it’s best known for its console-like gaming mode it also includes a fully featured Linux desktop, which is a major part of its appeal and the reason I bought a Steam Deck in the first place. For someone coming from Windows or macOS, this desktop provides a familiar, fully functional environment: web browsing, media playback, and other basic tools all work out of the box.
As a Linux power user encountering an immutable desktop for the first time, though, that desktop mode wasn’t quite what I expected. It handles these everyday tasks exceptionally well, but performing the home sysadmin chores that are second nature to me on a Debian system takes a very different mindset and a bit of effort.
Games run via Steam Linux Runtime which is the same across all Linux installations of Steam.
If you need to “tweak shit”, you have not fully compatible hardware (NVidia or so), something SteamOS won’t solve because it’s just a regular Linux distribution.
You already can. The SteamOS recovery image is explicitly for other systems as well since quite some time. People use it on the Framework Desktop, for example, even though the devices list does not feature that PC.
Don’t expect ever formal support for any hardware where Valve cannot control the drivers. They’ve been fucked by proprietary platform holders in the past, they don’t want to repeat this again. So either your hardware is fully supported by upstream kernel/Mesa drivers (which SteamOS already ships because it’s just another Linux distribution with absolutely not magic dust) or SteamOS will likely never work on those.