I thought the intention would be from preventing fluid accelerating and moving - thereby avoiding some dissipation?

An aero bottle already would reduce the distance fluid can slosh sideways, but increases the distance water can gain momentum in the other direction

If you have a BTA setup - and you brake - is there is a half kilo of water that shoots forwards - which could potentially affect handling - would baffles prevent acceleration or only spread out the dissapation across the chambers and end up with the same net forward force?