Either that, or the pvp advantages it would give some ships would require a hell of a lot of balance adjustments to correct. Ships with a square/round forward face wouldn't be effected much by barrell rolling, but verticle ships like the Manta and Hyena or horizontal ships like the Ravens Claw (which also rolls very fast) would gain a lot of advantage from rolling.
I don't really think anyone wants to fight an opponent that just rolls constantly, how annoying would that be?