PS: I went to Grant Cunningham's site. He's renowned for being a teacher. His site doesn't list what he's done besides teaching . . .
Those that can, do. Those that can't, teach . . .
So you're saying Grant Cunningham isn't somehow qualified and his opinion should not be considered?
Whose opinion is credibile in your eyes?
Everyone should think for themselves and ultimately come to thier own conclusions and make their own choices, but it is always a good idea to consult and consider what those who are generally regarded as being authorities in the field have to say. That doesn't mean they are always right on a particular specific topic, but I wouldn't dismiss their opinion so quickly.