I'm not sure exactly what you're referring to, but I suspect it's the issue with several mech models that are part of the CAB done in such a way that they don't take your company's paint scheme. They always just look a particular way (and often ugly). As I understand it (and I could be wrong, I'm not a dev or anything, I just play BTA a lot), this isn't really a BTA issue so much as it is a CAB issue.

But to answer your question, I've played hundreds (thousands?) of hours of BTA and yeah, I find it annoying, but you kinda just learn to move past it with time and not think about it too much. At least that's been my experience.