The game wont launch on Steam Deck

BenTenpenny​  Yes, either of those should be fine.  Any game that says it requires the EA App in the fine print (for example, the Sims 4 page says "Incorporates 3rd-party DRM: EA online activation and EA app software installation and background use required") would work equally well.  And you're right, it looks like the TS1/TS2 Legacy Collections don't require the EA App.

That's a good idea. Would ME: Andromeda or Legendary Edition work? I don't think I have any other EA games on Steam apart from TS1 and TS2 which - as far as I remember - don't need EA App.

BenTenpenny​  This is the first I've heard of the issue (in Linux) post-patch, although that doesn't mean much given the lack of Linux users on this site.  Do you have other EA games you could try to run?  If a different game works, and it requires the EA App (so not Apex Legends, which can be played using only Steam), that means Sims 4 is the issue.  If no EA App games work on your Deck, it's likely the App at fault.

I can flag this thread for EA community managers, but they likely won't be around for a couple days, and they're going to want as much info as you can provide.