Sharing data/settings already works great with the cloud.
You still get the same bulk as carrying around PC+phone.
The only reason is that maybe it's a bit cheaper because you use the same CPU for both, but the drawbacks (not being able to use both at the same time, slower proc for the PC) don't make it worth.
Not seeing those either. KDE Connect (and others) already do the trackpad thing, and there's plenty of prior art for switching to a certain program when a device is connected.
Sharing data/settings already works great with the cloud.
You still get the same bulk as carrying around PC+phone.
The only reason is that maybe it's a bit cheaper because you use the same CPU for both, but the drawbacks (not being able to use both at the same time, slower proc for the PC) don't make it worth.