Another way to think of it is if you're blurting out your thinking you're reducing redundant work and perhaps inspiring the other person to think of additional solutions that are offshoots of what you're dismissing. I see merits to both ways of looking at this.

Probably true for many. When thinking about hard problems I'm usually not thinking in language, at least not the kind we speak between us humans, so it can be incredibly distracting if I have to "translate" back and forth while both thinking and communicating.

Yeah I agree but that's why I think there's a balance. But the context here is the more nervous blurting which I think is going too much in the other direction. We should be comfortable with some silence and thinking.

But everyone has their own personal preferences. Which is perfectly fine too. But I think it's worth mentioning that, as illustrated by the comment, it's typically more acceptable to blurt than think silently. And there's the bias that blurting makes it harder to think silently by thinking silently doesn't make blurting harder (the uncomfortable with some silence part is not healthy imo. Of course long silence is a different issue but we're talking 30-60s)