Not really. Mods generally add elements, models, and textures that are not in the game.
Just because someone asks for a measure of sugar one day doesn't mean they will be robbing your house tomorrow. The irrational hyperbolic slippery slope argument isn't ever productive on either side.
Reasons all stated here.
If you wait to solve all problems before doing anything else, nothing will ever be done. There are of course far more pressing concerns, this doesn't mean discussions about other features or ideas cannot be pondered.