Now if I want to add some optics attachment, but in different paint - I need to create a new p3d file, change textures there and add a new class that uses this new model.

As a result:

1. addon size increases without anything useful, but duplicates of the meshes for each new color
2. in some specific case, like scope variants with 5.56 and 7.62 grids, it requires to duplicate entire list of the model variants to replace single reticle texture
3. it's hard to bugfix/support all these models during mod lifetime (changes need to be duplicated across number of files)
4. this prevents modders to create their texture for my attachment