Query, in several instances, you have mentioned straightening the burr. Do you know of any skate techs that actually do that? I do, when I sharpen my blades with a Pro-Filer. I do not remove the burr with a flat whetstone; I straighten the burr with a honing steel. But I've yet to come across a skate tech who uses a honing steel; they've all used a flat whetstone to remove the burr.
I haven't heard of anyone else using a honing steel. Usually a flat stone, and/or a hard rubber "stone". I also haven't seen anyone else use a belt sander. But whatever works for someone, is good.
I was shown how to use my first Pro-Filer by the pro shop manager, Don Giese, who sold it to me. He usually did leave the re-pointed burr, even on machine sharpenings, which is one of the reasons his results felt sharper than most of the others. Don coached, speed, hockey and figure skating, and I think he used to be a top ranked U.S. ice and inline speed skater. But he did a lot of custom work, and sometimes shortened or removed the burr for skaters who didn't take good enough care of their edges to deal with the burr, which is quite fragile. He is now largely retired.
The person who used to manage the pro shop at Bowie Ice Arena also left a long repointed burr, creating very sharp edges.
(Edge Specialties' instructions for Pro-Filer used to describe sharpening using a reopinted burr, but I rhink they have now removed most of the details.)
But most skate techs produce less sharp edges. E.g., Mike Cunningham, a respected sharpener at Skater's Paradise, with many high profile clients, mostly deburrs, by default. (He and I looked together at blades he sharpened under a microscope.) His theory is that the skater should not notice a significant difference in the way a blade feels after sharpening, as long as he/she sharpens reasonably offten. But, like any good skate tech, he too does custom work, and will do what the customer asks for.
Many skate techs who think they deburr, actually leave some repointed burr, that you can feel, or see under a microscope.
Blackstone Flat-Bottom V sharpening equipment grinds an edge that resembles a repointed burr, but I think the "V" is a little thicker than a repointed burr. I don't know any figure skaters who say they've tried it. Anyway, the entire shape is built into the way they dress the wheel, so is produced differently.
BTW, I think I got "over-burr" from the knife sharpening community, not the skate sharpening community. And I should note that I have yet to see a sharpening burr that is a clean, well-ordered sheet. Edges and burrs are usually quite uneven, under a 50-100x microscope.