My Aero 15 would never throttle, with a 7700HQ + 1060. There was a 700mhz penalty in that generation (3.5ghz vs 4.2ghz for the 7700k), but I kept it pegged for hours and it was rock solid.
Most laptop cooling is awful, but you can certainly find laptops that are well built if you look for it.
Not sure you should weigh bloatware, either. You can trivially install a fresh Windows or Linux and you have to on a custom built PC anyway. If you buy a premade PC, it probably comes with the same crap.
For what it's worth, I switched to a desktop once the core race heated up - now I've got a 12 core 3900X.
I can't believe how much faster it is when it's using all the cores. Night and day. Highly recommended. And 12 cores is barely scratching the surface of the crazy workstations you can build these days.
For tasks 4 threads and less, it would be a bit faster than a current gen Intel laptop chip, but I don't think it would have been worth the portability penalty to me personally if that's all I did with it.