However, I would also worry that signalling issues with a diverse external audience can hinder accurate discussion of important topics

Basically it ensures that all serious discussion and decision making is made prior to any meeting in informal conversations so that the meeting sounds good. Such a record should be considered a work of fiction regardless of whether it is a video transcript or a typed document. (Only to the extent that the subject of the meeting matters - harmless or irrelevant things wouldn't change.)

Because of this problem I would be more wholehearted in supporting other forms of transparency, e.g. more frequent and detailed reporting on activities, financial transparency, the strategic plan, things like Luke's Q&A, etc. But I wouldn't be surprised if this happens too.

That's more like it!