I'm going to clarify a number of erroneous assumptions being put forth in this thread:
1.- Regardless of how frequently your diver cleans your boat bottom, the media he uses to do it is 100% predicated upon the fouling he finds when he gets there. A statement like, "If you have your boat dived monthly, the diver should never use a scrub pad" is patently ridiculous. If your paint has outlived its useful lifespan and is fouling badly , that fouling may very well require an abrasive pad to remove it, regardless of paint type or cleaning frequency.
.
I'll repeat, your diver should never scrape. You should not let your paint outlive it's useful lifespan and reach the stage of fouling badly. That is patently ridiculous. If you clean the bottom often enough and repaint often enough then scraping will not be required. To base your objection on fouling after the paint is gone is no different than arguing on a bottom that has no bottom paint. It doesn't reflect best practices. We've never had scraping on any of our bottoms and we currently either own or are managing 7 boats.