Just make them expensive as hell type of payload similarly to the issue of AU-1/AM-1 etc where you have a plane with payload comparable to medium bomber.
There are tanks that can one hit things as well and have to reload long after that, so I wouldn’t say that they should be gone. But there’s both the payload cost and BR for specifically ground AB, so I wouldn’t take that away.
But in air mission - yeah, there’s no “more expensive” thing apart from 3 points for the bomber, so there’s no way to limit this apart from pushing the plane with it to higher tiers.
Ive suggested a random amount of plane spawns. The more a team loses the better odds at planes.
As well as limiting heavy tanks, medium tanks and tank destroyers.
There wasn’t an unlimited amount of these units. they were pretty rare