Even though this is true for like 90% of my thinking (that I can see when I try), so far I’m concinced this ist because I am a predominantly language-and-normal-grammar-rules thinker.
There are people that mostly think via associations of words that don’t have to be formulated/ cast into grammar.
And then there supposedly people mainly thinking in pictures or smth, without words.
Anyways for some people rubber duck mode reoresents a change in thinking method, I think