Not sure I completely agree with some of the comments, or observations expressed in the article. And who uses a 500w grinder in a busy bar......surely they would be using bigger boy's toys!
In particular, the grind speed I've found no real differences across the entire spectrum from terribly slow to blindingly fast......and that's over 38 years of wrestling with grinders of all sorts. I can't honestly say that slower grinders taste better......all I can say is faster grinders tend to appeal to my preferences better and that's probably because they are conicals.
Invariably, during the day I may revert back to a slower grinder as the other hoppers are occupied, besides the rolling of the eyes from waiting, waiting and waiting forever for the portafilter to fill with grounds, perhaps my impatience boils over and I cuss at that slow slug, it's never going to receive a fair opinion.
Each model of grinder has it's own set of nuances - it's up to the operator to first understand and then exploit what works well and workaround what doesn't. Some grinders are more forgiving than others and yet I've even owned and used grinders from the same manufacturer that were utter dogs (or Lemons for want of a better term). 3x Roburs......one of them is a dog.....all built within a couple of months of each other.
Some of the most amazing cups I've experienced have been off the Mazzer Kony E which is a smaller conical than it's big brothers the Kold and Robur. I've also enjoyed coffees from Compak E10 and F10's at work, along with a bank of EK43's, but give me the Kony any day as the preferred weapon of choice.
The distinctions are clear between flat burr and conical across all the manufacturers. I've never managed to enjoy cups from Mythios (although not tried the version 2 yet) but I tend to put some of that down to the "memory effect" of what I like in a cup from conicals - it seems that every time I taste a cup from a flat burr, it's not quite hitting the spot for me. Psychosomatic ? who knows !.