The switch is quite a bit thinner, but it’s running decade old arm silicon, so less heat to get rid of.
And you’d lose that slimness if you had to put the controls on another layer behind all the components.
Bethesda’s engine tends to be a lot more cpu intensive than gpu intensive, so cutting down the resolution will likely have a smaller impact.
They mentioned reworking their global illumination system in the direct, I wonder if they meant ray traced gi
You could try flashing the recovery image and re-imaging your deck. https://help.steampowered.com/en/faqs/view/1B71-EDF2-EB6D-2BB3
I’d contact valve support if that doesn’t work, they’ve always been great whenever I’ve interacted with them.