How can I describe authorship where the author often oversteps logical stopping points, or where the author introduces superfluous, tangentially related content?
Here are some more details to describe the situation I am referring to.
Suppose there is a true statement about the relationship between A and B which is what the author wants to express. Now suppose there is another true relationship between B and C which is true but has little or no relevance to the topic at hand. The type of author I have in mind would slide smoothly from A to B to C in a single sentence or paragraph regardless of the damage it does to the cohesion of the paragraph.
In short, I guess you could say such an author has a penchant for adding fifth-wheel ideas.
Some bad alternatives crossed my mind.
It is kind of like "logorrhea," except it's not about verbosity, it's about ideas. Apparently "idearrhea" already exists (informally) but does not really have the connotation I'm interested in. The type of author I have in mind is capable of writing clear individual statements, but they apparently have trouble evaluating what to mention and what to omit.
I think this word or phrase would be useful because I think it is a common affliction in poor student writing. A student writing for a prompt may write the entire document in one pass, spewing ideas down onto the page as they came into mind. If the student then didn't proofread for clarity of presentation of ideas, I can easily imagine this pattern of awkward chains emerging.