GMTs , why are they (for the most part), divers? (Not all of them, I know) and how about Pilot watches?

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I have always been intrigued by the GMT watches, more from the perspective of a complication than the real need to use a watch which shows two time zones at the same time.

( can someone elaborate on true GMT as opposed to, un-true GMT?)

Frankly speaking , if I want to know what time it is where I am and where I come from I can simply use my phone but of course, being a watch person as opposed to being a person whom wants to know the time (different types) a GMT would be nice.