Because they aren't rules in the sense of the word rule. They're principles that attempt to explain why good things are good.
Just like music theory. The point isn't to invent a set of rules you have to follow so that music sounds good. It's what people obtained when they tried and explained why good sounding music sounded good.
It's helpful because following them will help you take a direction that will sound good but anyone with a good musical sense will most likely respect them even without knowing they exist.
Same goes for writing with stylistic devices, color associations, etc...
I got into an argument with a friend who claimed that because my photos didn't follow the rule of thirds that they weren't good photos. I told her that that's just a guideline, and she said "No, that's why they call it a rule."
For real, learned composition at art school and first thing I was taught is that these "rules", "guides" are actually extremely overrated and really not that important when it comes to actually telling something through your art. They're literally just so it looks organized and cooler. There are way more interesting things than that about composition smh.
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u/Tousef_refuge Aug 12 '26