Ummmm like PP isn't a "trainer"?
As far as the controversy-you started the discussion with your very first post telling the OP that PP is the be all end all....Sorry, but the OP deserves to know that there is more to life. PP is "fluff", IMO. Yeah-it is nice, fun to do sometimes, and just one more aspect, but not "necessary". And I am one who has done it, so am NOT speaking without experience with it. I find NH most helpful for ground manner type stuff, I guess. Manners, loading, etc. But riding-not so much.