At some point in my life, I started going to meetings, and slowly started gathering good and bad experiences. Also, for some reason, during university I actually studied how to have productive meetings, and I’ve kept a few tidbits of wisdom from that course.
I hold this truth to be self evident: most meetings are a waste of time.
But there’s a corollary: it’s also hard to identify which of your meetings are a waste of time, and why. It’s hard to predict in advance whether a meeting will be productive.