There's something special about being able to speak calmly. I hear Jack Dorsey, the ceo of twitter, speak on Joe Rogan's and it's the first thing I noticed.
Even though you can still hear the "um" occasionally, it's clear that he carefully chose the words before he speaks. On top of that, he makes logical arguments and present facts at his own pace.
Perhaps because Twitter is a platform for conversation and as the CEO of a public listed company he needs to hone his speech proficiency. It still fascinates me when people are able to calmly dissect a controversial topic with clear head.
or perhaps he simply did a lot of deep introspection (which he mentioned he did) on a particular subject that he's able to articulate from first principle.
Either way this is a trait worth emulating.
Clear speech and writing often comes from clear thinking
When you care for a subject, it's natural to learn more about it. The difference is being able to grasp the whole spectrum of the topic, not just why that is the case but also the counter points.
When we're able to fully comprehend the subject, that's when we can begin to articulate better.
Although, the practice of putting thoughts into actual words is just as important, but that's for another day.