I have recently learned that meetings help with one thing we're really bad at, which is deadline and estimations.

Not meetings about deadline, or meetings about estimation, but the shared experience of having timed events associated with stakeholders and involved parties.

It's like an invisible cue system the brain adapts to and starts reacting/responding to in the form of scheduling and resource allocation. (Which can be a double edged sword for some people: e.g. when they wait until the meeting to ask a question)