+1
I have zero attachment to Google Groups, I created it because I wanted to have a place where we can have per topic discussions, where the community can contribute easily, and that is persistent.
The workflow with Google Groups is that you join the group and then you receive all the messages (or summaries). With Discussions you click "watch" repository button and then you receive all messages. You can reply to those messages from email.
If this works for everybody I'm happy to enable discussions and update the README.