Question: Need for Implemention A2A protocol with in frameworks also.

HI Team, I think all the frameworks should also implement this for the multi turn agent conversations. Currently I can see that even ADK framework also uses Agent as a tool or transfer full control to a sub agent. Instead they also need to have internal multi step conversation like this. This protocol is great for remote multi step conversations how about internal agents converstaions within the framework. Let me know if i am thinking it right?
Please help me in my understandings.Thanks !