...if only this were true.
My friend Joe has done a rather brisk business selling direct drive conversion kits for KMG grinders, specifically to correct for what's 'not an issue'.
KMG shouldn't even be mentioned in a list of possible suggestions, anymore. Aside from the forum being littered with complaints and issues, and deplorable customer service, there are WAY too many better machines available now.
If you're buying a grinder, don't short-change yourself because you already own a motor. That's like buying a Ford Fiesta because you didn't want to buy new tires... Buy the right machine, or expect to buy another soon after.