Parents actually teach their children a lot before they potentially head out for more formal educating, so even if we assume parents don't have teaching experie

Parents actually teach their children a lot before they potentially head out for more formal educating, so even if we assume parents don't have teaching experience from their professions, I don't think it is very accurate to suggest they haven't taught anything. I do question that having a single teacher for 20+ students teaching all subjects for the entire school year is obviously going to work better than motivated homeschooling parent(s). While teachers do have formal education on the matter, it also includes how to manage many children in a classroom setting and how to interface with schools and their processes. The part of the education pertaining to the subjects teachers teach is actually pretty incomplete. To teach elementary students, you have a major, but still teach them subjects that you might only have an average understanding of (like a history major teaching a music class). Given all that, it doesn't seem hard to believe that parents could do better for a single child than pre-school and elementary school teachers. As a child gets older their needs evolve such that no one person has everything required to best support that child. That is an advantage of schools (usually high school), but could also be solved with tutoring and other programs available to homeschoolers.