In short, no. A number of reasons why, - A disc looks cooler (imo) and there are many bar spinners but not many large discs kicking around so I like to be a bit different - A disc is much more stable during a collision with an opponent. If you watch the gyro forces acting on carbide or tombstone, the bot generally gets thrown away at funny angles meaning it takes a bit longer to line up for another hit. As a disc has mass all the way around, it's far more stable during a horizontal collision. If you watch some of PP3Ds hits, we either get knocked horizontally across the arena or launched up into the air but we stay near horizontal - It's easier to get more of the spinning mass to the outer edge where you want it to store kinetic energy.
All of which, especially the second point, is perfectly sensible... ...and begs the question of why you like dancing semi-out-of-control while hitting, warping and abrading your disc on the floor when you're flipped
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