I don't think this is true at all. If you have a bunch of engineers at the table, they have plenty of topics available, yes, but say you add a medical doctor to

I don't think this is true at all. If you have a bunch of engineers at the table, they have plenty of topics available, yes, but say you add a medical doctor to the mix, you've suddenly unlocked the topic of how the two professions compare, interact, overlap, etc. With just the engineers, you don't have that, outside of surface level speculation.