>If you're going to be buying a laptop to leave it plugged into the mains the whole time when doing intensive tasks, then you might as well buy a workstation ?

I'd rather it plugged into the mains so I can also plug it into a nice big monitor and a large keyboard and a mouse, so I can use it like a human being and not a computer appendage.

A portable device is for BYOD. Actually working with it while on the go? I'd never do this unless it's an emergency.