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You'll enjoy Deck then - I don't mind a little tinkering here and there, at least. I just played Dragon Quest Builders 2, which is listed as explicitly Unsupported on Deck - all you have to do is turn on the Proton compatibility layer before launching and it plays just fine (quite well, actually, better than the Switch version lol).Probably - I've definitely got a junkload of DOS games that I'll want to try to run, many of them from GOG. I figure there will be some debugging for sure, but I enjoy the tinkering (most of the time).
Becksworth's right - no Windows install at all. You boot into desktop mode from the power menu of the built in SteamOS, then go to Dolphin (which is a file browser/program installer thing, NOT the emulator also called Dolphin that you'll also be installing lol), go to Games, go to Emulators, and download and install the emulators you want. You don't even need to use a command line (which I've not used AT ALL on Steam Deck) or even the virtual keyboard to set up and configure these*. They are a bit fiddly, and you'll need to switch back and forth from desktop mode and "Games" mode (basically SteamOS/Big Picture mode) a few times to get them running properly, but it's doable (and thankfully the swapping between desktop/Games mode is pretty quick).Not that mine is coming anytime soon, but how are you running emulators on the Deck? Just native SteamOS apps through a separate Windows install?
Alright so for Retroarch, don't bother with the desktop Linux version, I couldn't get it to work properly on my Steam Deck. However, downloading the version available for "purchase" (meaning, free) on Steam itself, I was able to download cores and get it working very well. I need to get bios files for Sega CD and Saturn and put them in the right place, still, but other than that everything loads and runs very very well. I have an actually portable Virtual Boy! lol. N64 runs great, too - F-Zero X runs at fullspeed with no audio issues, for example.
With this, the Steam Deck is my favorite device of all time. Not even just gaming device, just all around device. I adore this thing.