Both Apple and Google are resisting that future. Samsung seems to the only one embracing it.

Microsoft has been showing that kind of integration in videos about the future of work for at least a decade: https://youtu.be/SO49Q-HcuKE?si=iCYcBh-a9RmODiVf

I mean you're not far off, I have clients who are pretty much all in MS surface + peripherals as their primary workstation for their employees. Similar thing with some clients and chromebooks/google workspace, not quite phones, but the idea of a portable device docked into a station is pretty much the norm. I've seen huge portions of different businesses barely rely on computers to be much more than a vessel for a different flavor of enterprise related apps

dock to what, and why? and why a mouse? the thing already has a touchscreen. If you want to type faster you can buy Bluetooth keyboards and stands for your devices today, including some Bluetooth keyboards that have a little slot in them to hold your phone or tablet.

If you have enough money to have the space for a desk with a keyboard, monitor, and screen, the cost of a dedicated computer to plug into it isn't going to be an obstacle. I think this is the reason we haven't seen docking take off.