Some kids have special educational needs. I have one that goes to a private because he was exceedingly bored at a regular school. Currently taking Calculus as a middle schooler–very very few places accommodate that. Another one needs something–I don’t know what–he’s not happy where he’s at. Third will be fine anywhere with an accelerated/honors track. Parents can push, but when kids are on the upper end of the spectrum, parents aren’t pushing the kids, but pushing the school and it’s a waste of time and energy with a principal who doesn’t listen.
Other people have kids that need help with dyslexia, or remedial reading, or other issues. Some school districts are better suited than others to meet these kids needs.
I no longer look at schools as “good enough” but I would love to get the right match for my kids to thrive and be happy. No point in spending 8 hours a day being bored and zoned out.