Honestly, the only outstanding thing about it is that it boots directly into Steam Big Picture with tight integration into the Stem Deck controls. Everything else is more or less standard Linux. (apart from some Deck-specific drivers that haven't been upstreamed yet)

But the standard Linux parts are great because it means that it can (and is) easily copied into other distros and that you can also use a standard Linux distro on the Deck.

So I'd say it's only suited for consoles where you don't need a full fledged desktop.