Adding to gkelly's discussion, as I've understood it, noisy edges as in growling edges seem to be due to the depth, speed, and carve of the blade during turns. It's a very different sound than noisy edges as in scratchy because of lack of run of the blade, toe picks, etc. I think it's from the precise shifting of a heavy, concentrated weight that produces that growling sound, I'm thinking someone like Alexander Abt. On the other hand, I think a skater like Kozuka who also had some of the best basics of his time, is not what I would consider a "growling" skater, his edges are very gentle and quiet.
It seemed like in the NHK FS, the rink was annoyingly mic'ed up quite heavily in some spots. It reminds me of
Mao's Skate America SP from 2006, in which the edges are so loud that it incorrectly gives the impression that her skating skills are noisy and imprecise. Dick Button even remarks that Mao is so "friendly to the ice, you just never hear her skates move" when you can hear every single stroke all the way throughout the video

If a skater like Patrick has skates that growl, maybe Hanyu has skates that purr? I don't see his step sequence as flat and scratchy, I see good rhythmic knee action and efficient acceleration from absolute stops with minimal crossovers, gaining speed through his turns, which is harder and more energy-demanding than having momentum to start with. He has pretty obvious inside and outside edges in my opinion.
More speed doesn't necessarily always mean good skating skills, but it's oftentimes a good indicator of it. It's the ability to control that speed through different turns, and the ability to accelerate/decelerate effortlessly, which implies the mastery of edges such that one can control their speed. Every case is different.