> The problem with homeschooling is that rarely is someone so well rounded that they can supply the full spectrum of education that a child needs. Blackbody vs an RGB source emulating a full spectrum. We all have cognitive blindspots.

While this is true, it's not like schools are teaching kids a full spectrum of knowledge either. In particular, a lot of practical skills are often not taught in modern schools - personal finance, cooking, basic home maintenance and construction ("shop class"), etc. How valuable some of this stuff is will depend on the child of course.