There’s nothing wrong with meetings. They have their place. Meetings are fine for talking about things but meetings aren’t the right format for producing things. If the expected outcome of getting a group of people together is to produce something then a workshop is a better format. An assumption for meetings should be that no production will be attempted in the meeting. The discussion will most likely generate the need for work to be done but it should be done outside the meeting.
Why are meetings so bad for production? Meetings are usually for a short period of time, an hour say, and may be at regular intervals, maybe weakly or monthly. So, that’s two things that make meetings bad for production; such a small amount of time to work in, and such a large amount of time between the sessions. Meetings are like trying to write a book by writing one sentence a week. Obviously it’s going to take ages. Writing a chapter in one go will get the book written far more quickly, but that requires a workshop.