Easily discovered yes, but easily fixed NO.
The physics engine and motion model is VERY complicated now. The results are great when everything works but some things have to be worked out, obviously.
It's not a matter of finding the problem and changing one thing by itself, in something like the submarine motion model for DW changing one aspect of behavior means changing any number of things in the code itself, and then you have to make sure that none of those changes make anything else different in an undesirable way.
Making it exactly the way it should be is a process that right now is closer to being the way it should be than not.
