On the contrary, I'd say that the Steam Deck has a lot in common with consoles, especially as modern consoles (PS5 and XSX) converge with PCs. The Steam Deck comes with a store integrated into the frontend, a verification process, and standardized controls and performance targets. It's basically a "pre-jailbroken" console. At the same time, the XBox Series S is showing a big reason why Valve might want to keep a single performance target for a longer than the normal constantly evolving hardware in PCs, and both it and the PS5 digital have removed any sort of physical distribution aspect to the definition of consoles.
I suppose I should clarify that I don't think they're likely to fully converge, at least not in the next decade (through the PS6 and whatever nonsense Microsoft calls their next iteration).
But it's increasingly similar hardware inside, consoles are increasingly supporting more general purpose computing (media apps, social networking features, web browsing, game/app stores), the experience is more customizable, patching has made it much less "the game is the game", and the stupid simple reliability has gotten much less stupid simple. I'd say that the distance between PCs and consoles has been gradually shrinking since probably the release of the PS3/360, mostly due to consoles moving closer to PCs, but the Steam Deck is a big jump towards a PC being console-y.
They absolutely are in lots of ways. Phones are too small to be convenient PCs, but there's not much left they can't do these days. If you look at the spectrum from phones, to phone-OS tablets (ipads or android tablets), to PC-OS tablets, to laptops, it's really not a solid line you can draw where things are dramatically different. The main difference is that the UX isn't designed to be good at being a PC.
