How do efficient teams and meeting culture belong together?

We, our clients' employees, and employees of companies we know tend to spend between 3.5 and 4 days per month in meetings and video conferences (strategy meetings, coordination meetings, conference calls, video calls). This corresponds to about 20% of the effective working time per month. Most meetings are mostly just a rehash of things we all actually already knew. To achieve an efficiency effect we had to change the workflow in the new project missions. So if it should be true that a lot of meetings are just a rehash of long known things, this coordination should be replaced by asynchronous updates and tasks. And this is where collaboration tools come into their own.