What do you think might be the overarching reason why some people are hard to understand when they speak, like they explain things in a confusing way?

Since I know sometimes people get upset when you dont get what they are saying

They are really Smart, so it goes over others head
Weird Communicators maybe
Lack of confidence in what they are saying
Having a propensity to ramble too much and get off topic
Maybe it goes over others heads due to opposite reason of option 1
It's probably a people that they are talking to issue
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What do you think might be the overarching reason why some people are hard to understand when they speak, like they explain things in a confusing way?
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