Following this with "What outcome should we expect at the end of this meeting? If there are next steps, what would we like them to be?" helps cut to the chase, and in my experience, things got better across the board. Sure, there were one or two folks who still struggled to create agendas for meetings - but it wasn't long before they were updating their LinkedIn profiles. Accountability can do that sometimes.
Long winded execs enjoying open ended meetings without any structure to constrain them. Which is to say, the kind of shops with micromanaging management who keep themselves busy with meetings with their own team.
The CEO of the company got caught fooling around with a co-worker and abruptly resigned. The new CEO came in and found out what a mess meetings had become and issued the same proclamation - if a meeting isn't productive and produce some actionable items, then it shouldn't be scheduled. If you're not 100% required in a meeting, don't go. If you're in a meeting and feel its a waste of time, then leave.
Just those simple rules got rid of half of my meetings and the several teams I was on suddenly were cranking through sprints, building some amazing apps and products and killing our delivery times. The entire company suddenly was cooking along. It was a real eye opener how you can really bog a Fortune 500 company down just by clogging people's time up with useless meetings.
I've been through too many of these. They like to sit at the head of the table and bask in the glow of their underlings like they're king for an hour.
In other contexts I'm notorious for keeping people on the agenda. It's generally appreciated.