I am in my 35th year. You captured what is wrong beautifully. Those who hated teaching went into administration or curriculum and instruction. They hated the classroom, so they got out. They think teaching is a science that can be boiled down to a foolproof formula (direct teach, group work, yadda yadda yadda). Teaching is an art, and these people lose the purpose of education in their quest for data to plug into pie charts. I've always mused that schools would be so much more efficient if we could just get rid of the kids.