There is more turnover in schools than the restaurant industry.

This is a really sad and problematic point. It's a big issue, but is a long-term issue, so it gets glossed over a lot in the face of shorter-term problems.

When I was in high school, I had 3 or 4 teachers who had also taught my parents almost 30 years prior. That kind of consistency is utterly and completely gone from schools these days.

Some places are better than others, but there are plenty of schools where it's essentially a completely different place after only a few years. My worst teaching experience (until this past year) was my only year at this one particular school, and my first clue was that out of a department of 11, I was one of 5 new teachers that year. I looked up that school's directory a year after being gone, and only recognized 2 names from those 11 as still being there, and every single administrator was different. I can only assume that other departments saw similar rates of turnover, and that school had essentially an entirely new faculty within a couple years.