I wouldn't say that. Especially when you consider slow speed grinding was what was done 150 years ago. Even if I no longer can endorse the grinder itself, I can without reservation endorse slow speed grinding. It in no way takes the skill out of the hands of the user. What it does is make the process much better because it removes a great deal of the problem - over heating. From what I've found over the decades is 250-300rpm seems to be the ideal speed, heat is only a small issue and material removal is much faster than a regular grinder. Even a couple hundred rpms more and the heat in the tool rises quickly. At 300 you feel like you have forever to grind a bevel. It allows you to grind with a great deal of care without the need to rush through before the heat rises to a problem level.
Sent from the bathtub on my Samsung Galaxy(C)S5 with waterproof Lifeproof Case(C), and spell check turned off!