Others have suggested the Switch 2 is one of the best endorsements for buying a Steam Deck.
(Not really a gamer, despite having written games, ha ha, but I picked up a Steam Deck a couple years ago to test a game I ported to it — and was duly impressed.)
If Nintendo charges $80 for games, this will normalize it, so everyone else will too. It won't be a difference between the consoles for long. The console, from the footage they've shown off, seems more powerful than the Deck, if the Cyberpunk footage is authentic.
Meanwhile, a detachable controller has already been their single leg up on Steam Deck, and now it's also a detachable mouse. This will actually be a better experience than the Deck (assuming the mouse doesn't hurt your hand). The Deck has best-in-class controller support as well as touchpads, but if the game does not seamlessly support simultaneous controller and KBM inputs, then you have to either map the touchpad to a control stick and deal with curving which sucks, or map all the buttons to keys and the left stick to WASD, and sticks for non-analog input also sucks. Whereas on the Switch, the mouse is just a mouse.