Not the same - I still want to be able to just use and carry round the one thing without needing a monitor, mouse, keyboard etc at every single location, but I basically never need to use it somewhere where there isn't a wall socket available.
When I bought a Thinkpad a few months ago there was an option to order it with a smaller battery (which I selected).
It seems ridiculous on the surface, since you'd think you'd just buy a desktop or something, but with a laptop with no battery, and hypothetically better everything else, it would eliminate the need for a bunch of other peripherals