I remember this happening ages ago when I still chemically straightened my hair. It was very, very frustrating
I could never get it completely straight (always had a weird wave or two), AND curling irons created only temporary curls when I tried to curl it. My hair looked awful.
Agree with you about all the different types of curls. I love that you can find different curl patterns on the same head, too. Honestly, I'm just in love with the way curls look all along the spectrum. Sometimes I stare at someone's curly hair - anyone's really, even my own at times - and think, "Wow, I can't believe something with that shape actually grows out of a scalp!"
Straight hair just does not have an awe factor like that, for me.