I think the confusion comes from the oracle-like knowledge of Monty Hall - he knows what is behind each door and decides which door to open based on that knowle

I think the confusion comes from the oracle-like knowledge of Monty Hall - he knows what is behind each door and decides which door to open based on that knowledge. If Monty Hall wasn't an oracle, and just opened a random door after the guess, people's intuitions would be correct.