Also just to add, some buildings may for instance have dual colors, for example light gray siding and a darker section at the front top panel. In that case, the Developers should be able to specify both colors to “tint” the texture.
It has to be done the right way like above to make flexible buildings for Developers but not grow the library size exponentially! It is much better to set some properties in a text file than be including thousands of extra textures in the library.
If you look at X Plane Gateway, it was a good idea, but all terminal buildings are the same boring gray color. There are no custom colors, custom signage, custom siding type etc.
This is the right way for MSFS to do properly.