The main point for these suggestions between rope drop and park close is that it's not an either/or proposition. Both strategies are useful for different types of people.
However, if people are banking on riding only at close, there's always a chance that the ride will be down, the weather will be bad and/or the lines will be longer. I feel that suggesting headliners always have short lines at park close, as well as suggesting you can always ride these rides multiple times at night, is a bit disingenuous.
Yes, I agree that at WDW, like all amusement parks, tries to get people closer to the park at close so they can clear the park. CMs have had long days and want to go home. I just hope people who enjoy riding rides late (I'm certainly one of them) realize this and don't try to jump in line past the actual closing time.