My first encounter with idle fees in five years went as follows: Pulled into Springfield VA as the 11th of 18 slots, started charging and headed to a restaurant for lunch, set for 90% limit. In the restaurant I was notified that charging was stopped at 80%, and fees would be charged after five minutes. The new thing to me was that your target would be reduced if it is set "too high",
Anyhow, I went out and entered the car, by which time a couple of cars had left, making me 7th of 18 slots. So I restarted the charging, raised the target to 100%, went back to the restaurant, and it got to 98% by the time I left.
Has anyone seen a Tesla statement that charging targets higher than 80% would be disregarded? I'm not complaining, it's just an interesting and understandable approach to keeping the stations as clear as possible.