When I'm using a laptop, especially doing real work, they heat up, the fans go crazy, the laptop is hot to the touch and everything slows down.
It almost makes you anxious. You're wondering if it's about to crash or go on fire.
I've always kept a Desktop PC on the go for this reason, a well cooled desktop just doesn't have these issues. With a laptop, I always feel like I'm compromising a bit.
I got an M1 Macbook Pro recently and it just doesn't have these issues, I fire up my whole dev environment and get busy, and it's still quiet and (mostly) cool, and I can't notice anything slowing down.
I don't care so much about the architecture differences, x64 vs ARM etc, but the fact that I can finally use a laptop like a desktop is massive.