The complaint is about the visibility of the flight duration (e.g. "this flight will take 1h 50m"), not the landing time (e.g. "this flight will land at 11:25am"). The landing time is prominently displayed in the flight info pane. Knowing your flight duration (gate-to-gate time) is not impacted whatsoever by flight delays, so I think you're conflating these two things inappropriately.