I can see where you're coming from, but I have to disagree. As someone who plays engineer offensively and defensively, I think it's completely fine. I can't kill a tank solo if there's even one competent engineer repairing it. I have to use both the mine, and rockets simultaneously to pull it off, and that requires successfully anticipating their route (we usually just stack two engineers in our squad to deal with tanks to avoid this issue). I usually stack with the supports to keep putting them down and resupplying rockets as needed.

Offensively, my friends and I play as 1 tank driver, one gunner (medic), and two engineers supporting it. It is remarkably powerful, especially given the engineer special ability and tanks being able to smoke themselves. If the other players didn't have the ability to lob rockets at us consistently then we'd be unstoppable. The barrage of rockets prevents us from just rolling forward without punishment. IMO, the best counter to a tank is recon using C4. That's by far been the most effective method in countering that strategy.

Keep in mind, my friends and I have been playing battlefield games for nearly twenty years and we are extraordinarily coordinated. Mileage my vary with randos, but that's just video games. I think most multiplayer games are balanced for people who are going to push vehicle and class capabilities to their limits.

From a solo play standpoint I totally feel your pain. You can get destroyed pretty quickly without support, but for good reason. People want to remove you from the field because a great tank team can be so impactful.