I guess that makes sense. I've never memorized that birthday-falls-in-x-part-of the year thing. I also skipped first grade when the teacher discovered I could already read, so I was spared too much time with those goofballs Dick and Jane, and their idiot sister Sally. Since my birthday is in June, I was sixteen when I graduated from high school.
I hope you won't mind, but I'm going to make a guess that you probably don't have children. My guess is that, if you did, you would decide to homeschool, too. :-)
Your school experience and mine are nothing like school today. Picture yourself with a daughter, for example. You probably would teach her to read at a young age, like I taught my son. Then you would take her to preschool registration, mention to the teachers and administrators there that your child can read, and watch them shrug off that information and stick her in a class to learn colors, shapes, and how to write the alphabet, even though she can already do all those things and more. The only thing your child will be learning new is how to line up and behave in a classroom environment.
If your child's birthday falls in the middle of the school year, you might even be able to pull some strings and have her moved up a grade level. But then you'll notice there are children two years older than her in her class, and some of them are cursing, and now the school wants to show her a video called "Family Life" so that she will learn to accept "all types of families." Meanwhile, the middle school she soon will be attending has a "lockdown" now and then so the police can search for drugs. Academically, she is still learning more at home on her own time.
I would almost bet that, given those circumstances, you, too, would pull your child out in an instant. ;-)