I always charitably assumed that they designed models to utilize surplus pieces for the internal structures, pieces that might be hard to use elsewhere.
They may do that (designers have a "part budget" they can spend in various ways) but the real reason for weird colors inside models is to make it easier to build; especially since many of the models consist entirely of various shades of grey and black.
Various piece size also makes it easier to see if you got the wrong piece.
They may do that (designers have a "part budget" they can spend in various ways) but the real reason for weird colors inside models is to make it easier to build; especially since many of the models consist entirely of various shades of grey and black.
Various piece size also makes it easier to see if you got the wrong piece.