Ah, I didn't expect it to be actually used RAM. Maybe this is a Linux issue with the Steam build then? Here is my Windows 11 task manager, Steam just downloaded 10 different game updates (so did plenty of work) and is now idle:
In total 516.5 MB RAM on a machine with 32 GB (22 GB free at the moment), if there was any pressure on RAM usage it would probably go down further.
Either way, since upgrading to 32 GB RAM nearly a decade ago I haven't had a single issue with RAM usage (While with 16 GB I actually had games in the past where I ran out of memory). So it's no big deal as far as I'm concerned and if I'd actually run any applications that needs tons of RAM I'd quickly upgrade to 64 GB and be done with it.
The only way this would be annoying is on low-end machines, like 4 or 8 GB RAM in total, but those have plenty of issues anyway in regards to games (otherwise why would you install Steam?). On a high-end machine complaining about 1 GB of RAM is a waste of time in my opinion, there are a ton of better topics you can rage at.