Some people try to use meetings to achieve things that meetings won't work for. That can turn an intelligent group into a dull and mean monster.

Meetings can be very effective for building on ideas but not for working from scratch.

A meeting where people can't stick to an agenda should not take place.

To consider if a regular meeting should happen, drop them and see what happens.

A bot can replace the daily standup meeting to quickly find out want everyone on your team is doing. The bot asks all the questions that usually come up during standup, compiles them into a report and posts everything in a public channel.