I think there’s just people that trust Valve more than Linux in general.
SteamOS on the deck is extremely foolproof, and people who are otherwise scared of Linux seem to think SteamOS magically fixes every perceived issue with desktop Linux.
That’s my best guess but I’m just some dude.
Just note it works with ANY Winamp skin you just have to install them manually, My install I got from the AUR has the skins folder located /usr/share/audacious/Skins/
You can find most classic skins here! they are obviously very low resolution and don’t think people are making HD winamp skins these days…