This is just talking about games approved through Valve's verification process. There are a lot of games that work that are "unverified", not to mention the entire history of gaming available through emulation.
I don't know what to tell ya, im sorry your experience is so buggy. My 7 year old child has been able to walk around and it enjoy it like a switch, thats literally all that matters to me. Lots of other people like to complain and it say its not stable at all, and thats just simply not true either.