You keep on asserting this false equivalence over and over when no one is making this argument. Making new tank specs is not the only solution, or the best solution.
I have also stated the real answer over and over in this thread. Make the tank specs they already have feel powerful and fun to play and more people will play them. That’s going to mean at least some amount of balancing. For example, VDH, PP and BDK have great utility and mob control abilities with stops and CCs. Some specs have barely any and just can’t handle the same types of problems anywhere near as easily. So you give an ability or two to classes that are lacking in that department.
It’s not impossible, it’s not hard, and it is something that would make those specs more fun to play which means more people would play them. It’s that simple.
Stop nerfing tank survivability, stop nerfing tank damage (within reason of course) and BUFF tanks where they are lacking.