They never pretended it was going to run literally everything. It’s a handheld.
The fact that there are still very few games it can’t run (excluding the publishers actively blocking Linux) is impressive, but it was always expected that some games would leave it behind.
Hell, the whole reason for “deck verified” is because their default assumption is that a game won’t work.
I’m not downvoting, but the fact that kernel malware games don’t work is a feature to me. It would be a full time job to keep from installing anything that demands obscene access for no legitimate reason on Windows. “It doesn’t work” is way easier.
Pretty much everything else on Steam works without effort.