If the instructor and the institution gain nothing from the process, then you are mostly right.

For myself, things always have gone better when there’s a little bit of turnover. The training gets better. The obtuse decisions get removed. The sharp corners sanded down.

With no turnover, people tend to memorize the system and eventually nothing material ever changes. I find it soul sucking and so I give a slightly negative score to highly stable teams now, whereas I used to count it as a pro (wow people like working here!).