Disclaimer, I don't think the drag change is good, because I don't think overpowered special engineering effects are good at all. Look at other MMOs, side bonus effects are never game changers. FD just introduced another 'game changing' special effect, to go with corrosive and scramble.
Having said that, you FDL people have to understand that you've had the advantage for too long. If an FDL and a challenger both have a drag frag now, the challenger will be able to keep up with the FDL (at least in terms of maneuvers). This is arguably a good change. However, this is a super weird, and I'm not sure appropriate way, to nerf the FDL and mamba.