Frank: I know the likes of Gravity would get under everyone, but they already do - as their flipper is just about on the ground (like most flippers nowadays). The point is that in most flipper-on-flipper fights, the outcome is determined by who has the lowest ground clearance all round. If every robot had a high back and sides, it would make the fights a lot more interesting, as no-one would be invincible (as everyone could be flipped by everyone else) and would hopefully bring driver skill into it more.

Plus if they were forced to have a higher back and sides, they might all be able to move with some wheels off the ground - no more Razer-esque single attack fights where one robot goes up on the other and gets grounded (hence beaten) within 10 seconds.