For the most part I usually see such arguments coming from people selling their RBSD programs (which usually end up being things most people with martial arts training already know) or occasional posters justifying their own lack of skill.
The dumbest one I remember was a guy on a forum who thought a typical Eskrima 12-strike/angle system was too complicated. He'd have the same problem with Hock's Combat Clock. He actually thought 12 strikes/cuts were too many to learn.
Maybe someday someone will come up with a 1 technique system, the 12 o'clock hammer fist/slash/hit with stick/psycho stab and sell it to gullible people.