Well, I am really into sounds. The specific sound that identifies a car, the mixture of intake, valves, exhaust and drivetrain. Many older mods have engine and drivetrain sounds that the mod author made very carefully, many are great.
You throw away all that work, make that car sound exactly like some other car you already know, and you have to do that just to get secondary sounds back. Brakes, winds, whatever, the sounds you need to get back have nothing to do with the car's personality.
Plus, people usually just plug in a Kunos sound bank, which strictly speaking is not allowed. Or if they use a sound bank from another mod, then well, most mods do not allow reuse of components of those mods either.
Anyway...
I would be much better if the fmod crap would allow using one main bank file and allow individual overrides from either other bank files or from plain sound file. The same way that the car 3D models carry all their textures inside, and for skin variations you can override what you like on a texture-by-texture basis.