Why is off-road driving usually preferred over clutch braking?

DomoSapien: I will prioritize off-road driving over clutch braking on most unless my traverse is painfully slow. Usually I want as much acceleration as possible to get  in/out of cover ASAP. 

On the T57 Heavy you notice an overall substantial improvement in driving over fields etc which helps with arty focus quite a bit. While we're on the subject of driver skills, is smooth ride usually worth getting? I figure it reduces overall bloom so aim time is faster as a result. And sweet full-speed autolock shots on distant targets are always fun.