At a Bible study meeting, someone commented on how “packed” Paul’s letters were. That got me to thinking how the circumstances under which something is written might influence both style and content.
A letter written with time constraints (and maybe material ones, like a shortage of affordable paper) and for some specific crisis would indeed likely be more “packed” and less poetic than an account of Creation, for example.
Consider also how the intended audience might affect both style and content: A letter to a demographically mixed congregation that would be read out loud, and maybe heard only once by many of its members, would be written differently than if the audience would be fellow Jews, with specialized education, likely reading it and studying it more slowly and carefully over a period of time.