In what sense is the steam deck more console than pc? I agree that there's convenience in it being a single target for people to work on, but it lets you run anything you want even on the stock operating system, and you can trivially replace that at will
The line between console and blurred significantly lately. Consoles became X86 machines running PC OSs but locked down. PCs gained options for console hardware with the same OSs.
These days the only difference between PC and Console is having a locked down OS. Which makes consoles seem purely a worse product, but the difference used to be a lot more.
I boot into a video games only interface. To update I click a single button. This is exactly a console interface and user experience
The deck is a standard configuration they can test for, the “works with Steam Deck” badge sells product, game publishers covet it. Problems with Proton get worked out.