I'll just never understand this. Chances are you are at the same desk day in and day out. You probably have monitors and external keyboard/mouse hooked up because hunching over a laptop and using a touchpad is unnecessary torture for a fixed workspace. Given that why would you hamstring yourself with a thermally constrained and overpriced-because-miniaturization-isn't free setup?
Until maybe these M1's (and I'm not entirely convinced) I've not in the 20 years I've been computing seen a reasonably configured desktop (eg not just a laptop on a stick ala iMac but an ACTUAL desktop) ever not smoke the pants off of every single laptop you could put up against it. It's hard to beat the one-two punch of lots of power and room to cool it. If you are sitting at at desk why the heck wouldn't you leverage that?