The problem is Steam -- or more specifically Proton (which you're likely using with Steam in most cases) -- has a load of dependencies and such. The advantage of the Snap version is it can be essentially sandboxed all together and not clash with everything else. I tried both ways and it really was exponentially easier to deal with it with Snap. At least in a setup where you also have other games and things outside of Steam.

Would be nice if the mainline itself could sandbox more.

the continued insistence on snaps was the final nail in the coffin for me.

I've been using Ubuntu since they were sending out bright coloured CDs in cardboard sleeves, but I've switched to Debian now. I don't want the rigmarole of uninstalling snapd and adding the Firefox PPA every time I install Ubuntu somewhere (quite often).

My new XPS 15 got Debian today after I realised I was wasting my time purging snaps from Ubuntu.