"Ironically, in my experience, just bouncing off ideas of one another is not the way this works well. What you can end up with is people throwing their ideas into the ring just for others to find faults in it. In the worst case, this can turn into a competition who knows most and who is smartest."

This right here is exactly why I learned to say nothing in brainstorming sessions and try to dodge then outright if I can.

My experience is these are typically for someone higher up in the pecking order needing their own ideas validated.

My usual work around is if something needs to be done, quietly work on a POC on your own and solicit feedback or even bring in stakeholders.