Samsung (Android??) DEX does something like this, effectively Android on a bigger screen with a keyboard and mouse.
I like the idea and the direction, those coming from older computers especially can just plug in their phone and sit down at he desk when they want to do more intensive things… like reading Facebook and replying to lots of emails
While it’s a step in the right direction, access to a real desktop OS and apps is my ultimate dream. It’s a bit of a shame that Windows Mobile has died as that had a lot of potential in this space.