You will be adding another handheld to that image soon id imagine Conina .
Probably... at least I'll reserve one and wait for reviews in November/December.
According to https://lgc.lysioneer.nl/ ~1400 of my Steam games should fully work "out of the box" and ~1600 of my Steam games fully work with workarounds.
But I hope that Valve adds a Steam library filter for SteamOS / SteamDeck until launch. That would allow dynamic collections like "SteamOS + controller support + genre x + single player without mandatory VR"