I see it more as a signaling process. “This is the time we’ve set aside to discuss all the possible issues with the proposal”. The point is to gather the feedback to consider it all together, and not to fan the flames of argument. Everyone gets a chance to say their piece, the time to respond to each criticism is after that call.
We sort of have this now in the EIP GitHub and “discussions to” FEM, but that is more written testimony whereas this would be really public. I think it should be the author’s responsibility to respond to all criticisms before it is allowed to move forward to Core Devs