Nested state/substates in Animator

We are working a lot with animator controllers, and that is very uncomfortable to work without nested substates in complicated character animator. What I am talking about is:
if we got substate1 --> substate2 --> state inside the animator controller, the only way to get hash/call directly state is substate2.state, but there are a lot of cases when we need to use same substate2 name and same state name in a different substate parent.
The best here is to hash/direct call entire substate chain: substate1.substate2.state
Here is issue about it.

We really hoped that will be implemented in 5.4 version.. but still don't see it in b19. Could you tell me please, when can we expect it?