Your control is greatly reduced in aerobars, but more importantly, your ability to defend your space is hugely reduced, which makes riding in a pack extremely dangerous. This video explains why having the ability to protect your bars prevents crashes: https://www.youtube.com/watch?v=sRIsWzrMmBs
Cycling has some dumb rules (e.g. sock length), but banning aerobars in mass start races is not among them.
Cycling has some dumb rules (e.g. sock length), but banning aerobars in mass start races is not among them.