Raymond Hettinger at PyCon 2015, Beyond PEP-8 — Best practices for beautiful intelligible code:
[Putting form over substance] happens all the time. It happens when we shift our focus. I had some idea of playing this little video here in the background. [..] These people are playing basketball. What you’re supposed to do is follow the people in the white shirts and count the number of times they pass. Try this for a moment. Count the number of passes. Okay and now handful of people are laughing or seeing what you’re actually supposed to see — a gorilla just walked through the middle of the scene. If you were actually counting passes most people — when I say most, 99 out of 100 — will count passes almost correctly and not ever see the gorilla.
PEP-8 is a style guide for the Python programming language.
So if you get yourself in a PEP-8ing mode what do you tend to see? Now this highlights it quite a bit. You tend to see the PEP-8 stuff and not what really matters.
This is a great demonstration of feeling like you may be doing something productive by following or conforming to guides. Guides exist to help surface clarity, but when blindly followed, you may miss the point. This not only applies to programming, but a lot of life in general.