Every PC I’ve ever used automatically detects and adjusts resolution to the display you connect to it. Even Nintendo Switch will detect when it’s docked and automatically adjust the display resolution. But on Steam Deck you literally have to adjust the display resolution for every game, every time you switch displays.
Since getting the SD I have shoved my PC into another room to displace the heat (until I get a mini-split) and I just stream from it to the Deck, whether docked at my desk or on the couch or on the big screen. But this really complicates that process unnecessarily.
This has also not been fixed in Nobara or Chimera.
What’s the limitation there?
It’s Linux though, that’s typically not what happens unless you configure it to do so
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Correct, normally Linux uses the highest resolution a display has but, as someone else already commented, the Steam Deck probably doesn’t do that because it’s made to run at about 720p and setting the resolution to something higher might cause the game to run very poorly by default or softlock.