> Imho once there is a "console" that is basically Steamdeck with builtin Steam store and a powerful GPU... in otherword a fully capable PC with desktop performance + the console user experience (or almost there) there is strictly no reason to buy a Sony/Nintendo console anymore

I'm not sure I understand. What kind of device are you waiting for? The way I see it, a "fully capable PC with desktop performance + the console user experience" already exists, it's called a gaming PC with Steam Big Picture.

> But it doesn't matter anyway, since if Valve can release an actually good "console" experience, with builtin Steam store... Nintendo and Sony have nothing more to offer bar a few exclusives.

If Valve releases a console with an actually good console experience, then great, one more console with good console experience to choose from. So what does it bring to the table that other consoles don't have? Their PC-gaming oriented game catalog full of games that are either also available on consoles or are for some reason unsuitable for the usual couch+controller style? Because if I wanted that, I would've bought a gaming PC with Steam Big Picture, a thing that already exists.