Of course, the Steam absolutely steamrolls the Switch's specs by a considerable margin. In all fairness, it is about 5 years newer.
In sales, the Switch will absolutely steamroll the Steam Deck by orders of magnitude. The best-case scenario for the Steam Deck seems about 20-25 million units to me. Switch is already well over 110 million. Something that also concerns me about the Steam Deck is the size and massive amount of DRM (and no physical games).
Simply put, the Steam Deck isn't for me. I'll just play the games on something else.
Lifetime Sales Predictions
Switch: 156 million (was 73, then 96, then 113 million, then 125 million, then 144 million, then 151 million)
PS5: 115 million (was 105 million) Xbox Series S/X: 48 million (was 60 million, then 67 million, then 57 million)
PS4: 120 mil (was 100 then 130 million, then 122 million) Xbox One: 51 mil (was 50 then 55 mil)
3DS: 75.5 mil (was 73, then 77 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima
