> Why do they think their hardware would not survive a move?

Stuff that is spinning and then stops may not come up again for mechanical reasons - there is relatively little energy required to keep it spinning, but to overcome the initial resistance and acceleration takes more energy than components might deliver as lube is dried out, gum and oil gotten sticky.

And that also holds true for solid state elements, particularly capacitors. They can simply blow up or otherwise fail under the strain of inrush current.

Other stuff can be mechanically damaged during disassembly, shipping and assembly. A worker lets something drop by accident, a cable isn't unplugged properly, damaging the socket as it's being ripped out, the truck drives over a pothole, the shipping container bakes in the sun for a few days leading to capacitors drying out or, in the worst case, cable insulations melting, flex cables where the softener has long since leeched out and now they're brittle, literally crumbling due to the vibrations and movement of a move...

And finally, there's the RoHS issue from the late '00s coming back to haunt us for really aged hardware - anything manufactured from a year before to two years after RoHS got in force can have issues with solder composition. Tin whiskers that get rattled loose by moving stuff around and cause shorts, solder-thickened traces that literally break under flex.

There's LOTS of stuff that can go wrong in a DC move.