After several years of music study, music I understood the basic rules of rhythm, note reading, and chords to tackle new pieces. I quickly learned that playing piano is much more of an art than a science with plenty of nuances and exceptions to the rules.
When is it OK to Break the Rules?
Keep your eyes on the music.
Lift the pedal at chord changes.
Keep your wrist level.
Play with a steady beat.
Make sure to follow the fingering in your music.
These rules can be helpful guidelines for beginners but intermediate playing requires the ability to fine-tune skills and adapt to the style of the music or even "break the rules" to achieve more artistry and avoid tension.
Different fingerings might work better for one player than another, pedaling can be utilized more like a dimming switch than the flip of a light.
Just like a teenager is allowed a bit more freedom than a toddler, approaching music rules at the intermediate level requires more flexibility. On some topics I've discovered that not even the "experts" can agree on the rules. I think the best rule is a principle taught by my moral development teacher in college. Does it help or hurt?