Hee hee, I thought that might raise a few comments!
"You missed aspect 3 and probably the most lacking in the engraving world - who is the best artist."
I would argue that the best artist combines the two other aspects I mentioned: best designer, and most adept with the tools (well, ok, and having the best understanding of the medium...and the worst temper, and the weirdest habits, lowest income, etc. Oh wait, that's me, and I ain't the best artist in town. Yet :X: :sm:). And "most lacking in the engraving world"? I'd definitely disagree with that! Thems fightin' words!

:vkg:
It's true that I haven't handled stippled work, but I've seen it up close and know how it's done. I still think it's basically a drawing method, although the tools, medium and outcome are different - just as they are when applied to a copper plate when printmaking. It was an outgrowth of diamond point line engraving, which was practiced in Holland principally by amateurs, according to Buckley's
The Art of Glass . There are stippled pieces out there that aren't gut-wrenching - there's nothing about the method (or the rarity of its use) per se that makes a piece of glass beautiful. Clearly Whistler was an outstanding artist!
If I implied stipple didn't involve reflection and transmission of light, I was wrong about that...of course it does. But both wheel engraving and stipple rely on what hasn't been removed to create their effects. I don't see the difference there.
Wheel engraving is mostly copied art? I don't understand that, and it's certainly not something that separates it from stipple. Frans Greenwood, the "father" of stipple, did mostly copies of copper engravings, and he wasn't alone in using them for inspiration - in fact, a likeness of Greenwood stippled on glass was copied from a copper engraving.