It seems as though there is a negative correlation between the number of people in a group and the quality of conversation. That is, the more people in a group the poorer quality of conversation.
In a large group, the intellectual capacity of a discussion needs to be diminished to a level that all understand the topics being discussed.
This may not be true of the workplace, a context in which an individual's success often thrives on their capacity to outshine colleagues.
Perhaps this exception to boring group conversations provides an exemplar for crafting impressive group discussions which are greater than the sum of its members.