I know some teachers who have written textbooks. I have also learned how little say some authors have or want in books that have them as authors. It is the editors who decide how things are written.
That said, my problem with homeschooling is that some of the more active and knowledgeable parents are giving up on public schools instead of fighting for them.
Then there are the parents who 'homeschool' because their kids cause too much trouble in schools. There are good and bad in both directions.
I have stayed active in school as a sub because of my grandchildren (the oldest of which is a teacher's nightmare - smart and outspoken).