It's like fighting nature for me to try to control my wave pattern; it's always there, ready to break out of the prison of straightness at any moment (I'm recalling this from long ago, when I used to straighten). Wind, rain --- anything could set it off, bendingm and twirling away where it always has and always will. It just feels better to let what's going to happen naturally emerge without a battle. I don't feel like me with straight hair.
Now, if you asked me the same thing about hiding my greys, you'd get a totally different answer, but then again, covering grey hair is a lot easier than fighting a wave or curl pattern, imo.
Dogs and nature abhor a vacuum.