What do you think is the main reason why when certain people talk, it's often hard to follow what they are saying, or why they speak low frequently?

Like when they say something and you often end up saying "what", "huh", and they have to ask that a few times, or they talk for a minute and people say "help me understand", things like that?

A naturally soft or weird voice that they overestimate and think people can hear them without having to modify it
Social anxiety or shyness
Social awkwardness
Too much gibberish or rambling, which could be from ADHD or Autism
Unusual speaking patterns, maybe from a communication deficiency
Rather not say
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What do you think is the main reason why when certain people talk, it's often hard to follow what they are saying, or why they speak low frequently?
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