I hear that. One of the things that bugged me about Homeworld was how all ship formations would revert to the same XY plane, and how all Z axis movement was done with respect to that plane, such as how rotation would basically stop at the north and south poles.
Getting the ships aligned on a plane looked kind of cool, but it should have been a formation thing to align on any arbitrary plane – plus, imagine how bad-ass it would have looked to have a circular formation of fighters with each craft’s “up” radiating out.