[Jeff Lee]

I've raced both. As Michael Beard stated, it "dumbs down" the racers. Anybody with no skill can hammer down some pretty good RT's on a pro-tree. And yes, you will have fewer redlights.
But the skill set required for a full-tree is much greater. It separates the posers from the real racers. It gives the experienced full-tree racer an advantage over others. And that is the point and that is why you hear resistance.
Sorry...just the facts!