your text is too ambiguous: “within the time noted”
Without telling them that there is a 5 minute timer, how will they know what the noted time is?
Your assertion that pax are not stupid is a half truth, some of them are and others are not informed. While driving Lyft last week, I had a pax ask me to clarify Uber’s policy on tipping. She understood Lyft’s because there was an option to tip in the app but was confused about Uber’s.
Also, your do unto others reference goes both ways. Using your assertion that pax are not stupid, THEY KNOW that they have 5 mins and that waiting is costing the driver time/money and as you say they quickly see what they can get away with.