Great, Simon! Thanks for helping me be clearer.
We’re a community for writers, so we give feedback for the texts we write and discuss texts we read.
Live discussions happen through Google Meet, exactly, and we have the Discourse platform available for people to exchange before and afterwards – and also for discussions unrelated to our meetings (if we have a live feedback workshop, I don’t necessarily want them to re share feedback on the platform – they could talk about publishing processes, hardship on their writing processes, books they just read and want to talk about etc.). Live meetings are designed to foster human connection between them, while the forum is meant for discussions in general.
I don’t know what AV means, but yes, the live meetings “steal” the traction of textual exchanges (I had envisioned they’d boost them).
This last event I tried an activity of feedback writing for other members, so they could publish the feedback developed during our live meeting on the platform. I guided them through the process of reading, quoting most interesting parts, then writing first impressions, then deepening them etc. etc. They all liked the exercise, but no one posted it 
I understand there’s also a cultural and behavioral aspect – people need to get used to having the platform always available, they also need to understand better what they could share there, 'cause it’s a new solution for this niche here in Brazil. But that’s a problem for another post hehe