What I probably shouldn't say, since I haven't seen recent Edea boots, is that AFAIK, you can't reshape the soles, which is to me one of the most important parts of custom boots.
In particular, as far as I understand it, and I could be completely wrong, the uppers of their boots are constructed much like fiberglass or carbon fiber boats - a plastic resin bonds fibers together. And, again I could be completely wrong, I think their reshaping technique involves heating the the resins to the point of being "plastic" (i.e., deformable, creating new bonds as the old ones are broken), then stretching the material to shape by forcing the fibers slide against each other. But if I understood what the fitter said, the soles can't be deformed that way.
Or maybe everything has all changed for "microfiber" boots.
When I had an Edea fitting (years ago, and not with microfiber construction), I think by the person who owned SkateUS (he came to a competition, and customized one person after another in fairly rapid succession), I was told that my feet were too different in shape (wide toes, narrow heels, and of a size about halfway between their stock sizes) for reshaping to work. So there may be some limits.
Please don't take my skepticism as authoritative. Maybe they CAN do a good job now, and their boots can be made to perfectly fit almost everyone. That would be nice.
I thought a bit more about these double helix (hi-lo) screws. Much of the indicated advantage over just using more threads/inch in a single helix thread follows from the narrower angle (30 degrees vs 45) in the thread shape. You could replicate that angle in a normal thread - but maybe that would go against the conventions that people who use screws expect. I.E., the standard that people expect is a particular thread shape, (just like a pan head screw is expected to have a countersink, and a round is not). Whereas the convention for hi-lo screws is the narrower thread angle. People don't expect to have to check the thread angle when they replace a screw.
I do see why you can screw them in more quickly, because it requires fewer turns to screw them in. But perhaps abandoning the self-tapping feature - by having a blunt end - eliminates the time advantage.