Vehicle imbalance on breakthrough?

The decision to remove defending teams from having vehicles at crucial last points in maps while giving the attacking team 2 tanks or more at times has made some of the maps very unfun to play as a defending team as there becomes an inevitability about being steam rolled by tanks. This also pigeon holes the defending team to have to run a heavy engineer side in order to deal with them and if you are a support main like myself you are totally at the mercer of the tanks and makes reviving nearly impossible in certain instances. I just feel there should be a vehicle option for the defending team on crucial last points to make it more fair and balanced.