Part of the charm of the steam deck is the price/fun ratio. And the fact that many have tens or hundreds of unplayed games in their steam libraries. Ive seen plenty of people wanting for a "higher end" steam deck at a higher price. so it has a market, but perhaps a smaller market than the steam deck. It depends on the price i guess.
For me, i was a bit on the fence about the steam deck, as i wondered how much id actually use it, but on sale at £315, i couldnt resist. I actually like that it it doesnt run windows, (but i also like that you can). I'm surprised it works as slick as it does. but early adopters might have had a different experience.
When Valve do something, people take notice. They hit it out of the park on this one.