Yep exactly. If you go into a meeting and you haven't talked to at least a few of the people there about the topic beforehand, IME it's not going to be a productive meeting. I usually start with getting feedback from one or two subject matter experts, building consensus with them, and then slowly expand my circle of people I get feedback from, until we have "the big meeting". Having a "big meeting" with no pre-established context usually wastes everyone's time.