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In his novel class, Jim Sallis often says not to settle for "first thought" ideas. They're usually not original, nor especially creative. He also says a danger for writers is to think you "know how to write." The idea there being that you should always be open, indeed searching for new ways to achieve the effect you want in your fiction. I assume this would apply to writing non-fiction as well.
In Andy Soltis column "Chess to Enjoy" in Chess Life Magazine (November 2010) he notes that even top-level chessplayers often fail to force checkmate in the most efficient manner, i.e. the fewest moves. This happens both when they solve chess problems and when they are playing chess games. He writes: "This phenomenon is striking to psychologists, who gave it an impressive name: the Einstellung effect."
The basic idea is that you tend to solve a problem with ways you know and are comfortable with even though there may be a better way or ways to solve it. It seems to me that Sallis is warning against the Einstellung Effect in your writing.
Beware!