I explained it before. So to understand that logic, I'm not repeating it a third or fourth time. Instead I will lookup... and you know what, there is new information for me that makes it 100% clear (it wasn't in the past). You are actually right in this discussion, have a look: https://partner.steamgames.com/doc/steamhardware/compat

Performance: Default Configuration: the game must ship with a default configuration that results in a playable framerate. On Steam Deck, this is 30fps at 800p, and on Steam Machine this is 30fps at 1080p.

Well there it is. All this information was not there in the beginning and I guess Valve added and made it unmistakenly clear about what "performs well" means. Guess I was still daydreaming about the beginnings of Steam Deck / Proton compatibility and badge talks.