Horses for courses IMO, there is no one board perfect for all conditions. Pro's not riding them might be a bit more about the conditions they get to surf / film in rather than the design (a quick search on YouTube will show a few pro's enjoying and making these boards look good in less than perfect conditions). If we were blessed with perfect smooth 3'- 4'+ waves all the time, then maybe I wouldn't own one, but for what we have most of the time, I haven't had a more fun board (9 in the last 2 years and quiver is now down to 2).
is slow and never really get onto a plane as a more accepted style of board does.
Here I have to disagree - the 3 different manufacturers versions that I have ridden all accelerate with the slightest pressure on the front foot, it's in fact one of the things I enjoy about this style of board, fast and responsive, then there's the extra stability factor as well.
I can't ride a 7'1" x 24" or even a 7'4" x 25" (maybe should clarify, could probably surf them OK, but would have to be a prone start) zero chance of standing in the line up waiting for a wave but I can stand pretty comfortably on my 7'2" x 27" and have a heap of fun in most conditions.