I just set up Nobara.
Shockingly straightforward.
Entire install process was very simple, with a GUI, then a neat little post install app that gives you another very straightforward GUI for running your first batch of system updates.
... Oh, and I was able to do this on a SteamDeck, without an external mouse or keyboard.
Nobara has a SteamDeck edition now.
The install process has a bit of Deck specific jank, basically i just had to change the screen UI scaling level from 175% to 100%, it defaulted to 175% when booting from the SD card i wrote the ISO to...
And then there's a bit of jank doing initial updates off the 'bare metal' install, because the SteamKeyboard overlay thingy will prompt your admin password for a system access prompt... which will disable most of the SteamDeck inputs for everything other than Steam untill you input your password to allow it to work.
The work around I figured for this is... when that prompt comes up, you push the steam button and hamburger menu button on the physical deck until you get Steam in big picture mode.
Then your controls all work in Steam.
Then you close Steam.
Then your mouse works via trackpad on the desktop, but the X button to bring up the SteamKeyboard does not.
So then you open Steam again.
Now the SteamKeyboard does work, and you can type in your admin pass to the system access prompt.
I had to do this silly process a number of times through the initial set up 0.o
I eventually set Steam to not automatically launch itself, and now that all the updates have gone through, I just have to mouse (trackpad) over to manually open Steam when I am in desktop mode and then give Steam the admin pw for the keyboard to work... just once per desktop session now that its all set up.
Probably I also could have gone back into gaming mode and just bound a button to whatever button combo Nobara/Fedora uses as a shortcut to open the actual Nobara/Fedora virtual keyboard, but I could not figure out what this key combo actually is lol.
But uh if you're just looking for an OS for a standard desktop PC, everything I've outlined in the above spoiler is not gonna be a problem, and you'll likely have a very straightforward install process.
I'm also a fan of Nobara's default UI... kind of a gnomeified KDE?
As well as its default apps, built in DeckyLoader and plugins for the Deck, ProtonPlus for runtime environments, and of course its built in kernel customizations/optimizations for to play vidya gaem.
Oh, and I went with Nobara over the default SteamOS because SteamOS on a Deck is a read only OS by default...
You can install flatpaks, but if you want to actually install new core packages, those will get wiped with a SteamOS update... or you have to use DistroBox... which may also get wiped on an update?
Not sure, but Nobara allowse to use the deck as both a Deck and a more standard desktop linux PC with more customizability... and not having to rely on the AUR, which I find incredibly frustrating.