> I have hundreds of games

You do not have hundreds of games. You have a non-transferable license to play those games while they are made available by Valve and while your account is not banned.

Aren't steam account suspensions pretty much limited to criminal activity? Any other kind of restriction doesn't prevent you from playing the games you have licenses for.

For the most part, yes. There have been rare instances of Games being removed from Steam though (not just the store) and more common cases of games being significantly altered compared to the version you paid for (e.g. removed soundtracks due to licensing disputes).