[craz8]

There are gaming “laptops” available now that come with 2 power adaptors, as a single 330W is not enough to power the system under full load

For now, they can be on the same circuit

[walrus01]

It's not so bad if you think of it more like a folding desktop that can occasionally be transported from place to place. The total weight is a lot less than a mini-itx chassis and a standalone 20" class monitor... But not by much.

[zamadatix]

There are e.g. 780W single units out there. Basically a PSU in a more convenient box. A little easier to pack up.