The thing is, a lot of meetings start with presenting evidence of a problem, then have some discussion of the problem and potential options, and only in the last 10 minutes do the proposed actions turn into firm decisions with names against them.

And often if I'm in a meeting it's because I think the problem is important and I want it solved. Getting permission for my team to fix things, or getting other teams to agree to fix things, is the point.

I'd rather have a 5-minute break built-in for everyone by starting 5-past and actually enforce meeting end-times. Behaviors would change if people knew they had 25 or 55 minutes for a meeting and that folks would just leave when the time is up.