Katy or Minnie + dmg buff and active = Any boss dead.

Not that it matters much. I stopped 99% of levelling at christmas despite being a late starter.
Simply no content of relevance that makes the time spent worth it.

Level tanks to get tanks to level to level them for?

Not to bitch. But content starvation is severe once the story is done and h-content is hyper gated and of subpar quality.
The games redeeming feature imo is that it is ok to send 10mins in now and then to lane "RTS" a bit.