Why Do We Need Rules For Poetry?

Why do we need rules for poetry? Let's make a Haiku with ten lines and one hundred syllables. Let's make a limerick with ten lines, and not rhyme it. Let's just do whatever the hell we want to do. After all it's yourself that you want to express, Do whatever the hell you want to. You don't have to listen to anyone. You don't have to follow rules. After all you say it's acceptable now. This is modern poetry, I am not governed by archaic rules, put forth, By men and women thousands of miles away, Or in some foreign country. I am me, I will do as I wish, and no rules apply to me. Why do we need rules for poetry? Beats me.