Why do I feel every meeting has a rambling motormouth that will speak for at least 80% of the meeting, making the most obvious, remedial "points" (with illustrative anecdotes of course and repeating them over and over) and then keep the meeting running late?

Taking up airtime gets you promoted. It's kinda that simple.

This sounds like a former CEO I used to work with. Huddled an entire team into a meeting g bc he wanted an update, proceeded to talk through 80% of the meeting time.

End result: someone was appointed to send an email with the update.

Hey, it’s our new VP.

People with no social lives outside of work tend to do that. They have no one to talk to other then on meetings, so they talk a lot on meetings. They are not aware of what they are doing, but it is a consistent pattern.