Since most phones ALREADY support USB Mouse, Keyboard and HDMI screen ... (My Ancient Sony Ericsson Z1 does) why isn't such a feature simply a HDMI + Bluetooth dock (or custom Power + USB Data + HDMI dock) with 1920 x 1080p 16" screen that works for almost any phone, no matter OS?
Even my Symbian E65 had some sort of option. Really this isn't hard and should have been in all Smart phones since Win Phone 6.0 Era.
I certainly don't want a proprietary dock that ONLY works with Win 10. I've tried my ancient Z1 Android with an HDMI screen, USB Keyboard and mouse on a hub. Main issue is some applications and lack of multiple windows.
If one had a phone with 32G byte SD card, dock with WiFi, ethernet, 4x USB 2.0 and HDMI for a screen, then many people wouldn't need a laptop. No need to sync.
You'll prize my real x86 32bit laptop out of my cold dead fingers, but really someone could have done this properly 14+ years ago (I had Nokia Communicator).