I have the Steam Deck + Odin 1 and I echo your thoughts on this. Steam Deck for me is great mainly for PC games. Outside of that, I tend to run my emulation on the Odin 1 just for the massive difference in battery life + lighter to hold.
If this device can run Switch emulation with no frame...
Use EmuDeck to generate a new list of apps/games and Unselect Nes games to appear on Steam. Leave only EmuStation and/or Retroarch so that they can be accessed from there
If I'm not mistaken Fallout 3 was developed in-house whereas New Vegas was developed by an outside studio.
Expanding: Both games still are under the Bethesda publishing arm but I'd gather they favor Fallout 3 more because of the above. Somewhat similar situation to what happened with Mario...
Hot take but I think the Series S is actually helping this generation in ensuring most of the games that are released be 60fps on PS5/XBSX since developers have to ensure the game works on Series S at a level of at least 30 FPS.
That's a lot of inference from a simple question he is asking the folks in this community lol...
Imagine trying to shutdown a discussion because it hurt your feelings lol