[BScout]

There are no "specialized skills" in any of these "DAW builders"
Just people who know how to assemble components (that they are then middlemen on increasing the price of said components.)

You can return a computer to Dell (or HP or any of the big makers.) And the workstation class computers are meant to be always on. 3AM and the power supply burns out? You can have a power supply at your place by 7AM for free ready to go. (This has happened with a system that choked on unexpected construction dust.) 24/7 support lines, FedEx contracts, supply depots around the country that keep stock of all parts. 5 years down the line there will still be parts availability.

You want silent, HP, for instance, offers watercooled options in their workstation class computers. (Not a big concern for myself as we have machine rooms but have done it before for in-room systems)

And laptops aren't desktop/workstations. There's a lot traded in for thermals and battery time.