vehicles should not be able to use weapons within the main base area.

It's a great idea, but would need to be tweaked depending on the map and game mode. For example, in breakthrough, there are some where the HQ is so close to the first objectives, that a vehicle would be useless if you couldn't use it in the HQ. So just apply this rule to only conquest? It gets messy and complicated thinking about it. And I think EA avoids messy and thinking; so probably nothing will change.