Thanks for the great discussion. I am fine with everything but the last paragraph.
But first, let's respectfully still disagree in general. However I think we're just expressing it differently.
So, from a pc perspective the steam deck is obsolete, since my 14" notebook is a far better device to me. And it's highly mobile too. Thing is, this point is basically going nowhere since with price and over all sectors there will always be a (technologically objective) better device. Why don't we all buy pro tools? Well price for one. It's always about the ratio. Anyhow, just for clarity, I'm really fine with disagreeing here.
Regarding the last paragraph: just recently I had a talk with someone interested and she was looking for a mobile device. I told her about switch and also steam deck, showed both and highlighted the experience differences but as the main point I told her she at the single most important thing needs to look into the game libraries which suits her otherwise she will have a paperweight. It is always and has always been the software that sells the systems.
The perspective buyer wants to play a game and deserves the best experience. On whatever current or future system that might be, and has to weigh in on the price he wants to spend. And that's what I would recommend.