and moderator of PuristS Travel forum, I'm afraid that you are right.
The GMT hand is infrequently used but when it is needed, must give impeccable service. It is usually used when one is tired, drunk, jet-lagged and in a different time zone. At a glance, it must immediately warn you NOT to call home (when hometime is sleeping time). There must be no need to peer with a magnifying glass or wait until the other hands move out of the way to show the GMT hand.
That is why most GMT watches have a:
Regards,
MTF