I had this for the longest time. Very imbalanced academic performance because I could get the answer and understood a lot of things, but had huge trouble with written work. That is, converting the thought process into a linear stream of words and sentences. I suppose it's like serialization of objects in memory.
Edit: maybe this is like the difference between a diffusion model and a "next token" model. I always feel a need to jump around and iteratively refine the whole picture at once. Hard to maintain focus.
But taking a step back, this process of converting reasoning tied to experienced consequences into words that have relatively stable meaning and interpretation over generations is what is "academic".
Without that, one does not learn quickly what another human already thought and tried out in the past (2 hours or 2 years or 2 millenia ago, does not matter), the civilization never progresses to the point it has, and we reinvent all the same things repeatedly ("look ma, I strapped a rock to a stick and now I can bash lion's head in").
So really, if you struggle with this part of the process, you'd need to rely on somebody else who can understand your "invention" as well as you do, and can do a good job of putting it into words.
Really, this is what makes the academic process, well, academic.
Edit: maybe this is like the difference between a diffusion model and a "next token" model. I always feel a need to jump around and iteratively refine the whole picture at once. Hard to maintain focus.