You mean exactly like it's happenning in the mailing list right now? Even when the discussion is public, it seems some people prefer to rant on social media instead of contributing to the official discussion.
Even if they meant Monday 26th, that's not a lot of time to have a proper discussion.
Is there a formal policy document you can link me that defines the process how additional data collection are added in mozilla projects? It seems to me that what we have is a in-prompt discussion because people happen to detect a change and managed to raised the issue just before it went live. A formal process would make people trust the project that issues like this isn't depended on the chance that a data collection will be detected before it goes live and only then be brought to discussion in the public mailing list.