Earlier quoted context omitted.
Yeah, it's almost surely a case of remembering the handful of times when the clocks were inaccurate because they caused you trouble, while forgetting the hundreds of times when they worked correctly. They do work correctly most of the time, and the A division works even better than the B division, as you'd expect. (the opposite of what OP claimed.)
> Yeah, it's almost surely a case of remembering the handful of times when the clocks were inaccurate because they caused you trouble, while forgetting the hundreds of times when they worked correctly. It absolutely is not availability bias, as demonstrated by the concrete data included in one of those links. But even if it were - the whole point of having those signs is to alert you about the actual state of the sub…
Do you have a source for this? I'm positively certain it's not true. I time my commute every morning with the online subway clock that matches exactly with the one in the station -- I leave my apartment when the Q is ~8m away and it always arrives shortly after I get to the platform. I've only encountered one situation where the clock was unacceptably wrong: a downtown A train at 59th that was 1m away for over 5m. That happened over a year ago and I still remember it.
Similarly, when delays happen the clock does get updated accordingly. Today was a good example -- 24m for the next N train during commuting hours :/
I think you may be confusing the countdown clocks with the kiosks. Once upon a time they did display the scheduled time. I'm not sure if they still do but the above head displays are without a doubt more accurate. Anecdotally speaking, the margin of error seems to be roughly +/- one minute. I'm aware that's anecdotal evidence but I simply don't believe that somebody could take the subway on a daily basis and think the countdown clocks are that inaccurate.