My source here is that my wife was an FA for many years. She has a couple stories of pilots deliberately not pulling all the way up to the gate if they know they're going to have to wait anyway, purely so the crew can stay on the clock (and it doesn't make any difference to the passengers either way). Though for every one of those instances, there are a hundred of being delayed in the airport or after-boarding-but-before-closed-doors or whatever that ends in hours of unpaid work time.