Yep. You can have smart kids in a good school and if you at all care about their education you may find yourself...ahem....”supplementing” what they learn during the day. At that point, you are almost homeschooling.
My wife taught in the public schools so she know exactly what goes on. She now homeschools our kids.
My wife taught for 11 years and has lots of teaching certifications. We homeschool and all three of our kids are far ahead of their peers. They are also heavily involved in elective classes through our homeschool co-op and all kinds of activities.
I realize it is not an option for everyone, but we are totally committed to it and feel like it is the best choice for our family.
With that said, I know of a few families where the children would be better served in public school because the mothers are struggling to teach them or they are not committed to it. As children get older they are much better at learning with minimal input from various curriculum, but it does not work with at the primary level unless the parent knows what they are doing, finds the right curriculum for their child, and invests the time and energy into it.