While this is perfectly true, many, if not most on this forum, either have switched or are switching to modern PM tools like Doug Thompson's. The carbides created in the steel are far more numerous in Vanadium and Cobalt steels and the AO wheel does not cut them, but simply knocks them out of the steel matrix.
So if you are using the new steels, CBN is the way to go to get the most of of the steel.