I don't know of any science. But for me personally, I find that, for very long and complicated thoughts, increasing the size of short term working memory helps

I don't know of any science. But for me personally, I find that, for very long and complicated thoughts, increasing the size of short term working memory helps to prolong the time before the moment when I start to doubt my own ability to keep track of all relevant facts. It's good for solving problems, but less so for work with an audience, e.g. writing clearly.