I've had this argument with people on both sides of it. Yes, technique is the most important thing. However, when it comes to wakesurfing, the size of the board and size of the rider can require a minimum wake size or you simply can't do it. EX: Big guy on tiny board behind no ballast wake is going to have an extremely difficult time surfing compared to a small kid on a regular sized board with the same wake.

But, maybe that's another point altogether. Get the right equipment for your wake instead of whining about the limitations of your boat or its wake.