I dont think healers are that op. If you can follow little waymarks and coordinate little your burst, opponents die pretty easily. You just need to do lot fast swaps so healers can not follow what are you attacking. They have weakness as well, they can not kill opressors or other vehicles that easily as dps can and can not heal vehicles either. Ofc you can not kill healers 1v1, but they can not kill you either. They can not do damage while moving so you can freely run away from them.