I agree with Lucas, watches are tools at the end of the day. For most enthusiasts, watches are a mixture of a tool and aesthetic jewelry. As technology progress, some "jewelry" will get more tools and some tools will get more aesthetic. Maybe that explains the popularity of the GMT function over the past couple of years.
The GMT was originally made for pilots and is probably the most popular complication for the pilot and traveler. However, look up "pilot's watch" and the primary difference is the style of the indices. Just recently, Garmin came out with smartwatches specifically made for pilots. The most recent is the Garmin D2 Mach 1. Nice titanium case and bracelet with a battery that will last up to 21 days (though just 24 hours with the moving map running constantly). As a tool watch enthusiast and active pilot, I had to buy it. This is after swearing off the Apple Watch because it will "never" replace my Breitling Aerospace. But the Mach 1's moving map GPS, barometric altimeter, oxygen level sensor, horizontal situation indicator, and my local airport's weather constantly showing on the watch face was too much to resist.
I wear the Garmin when I go to the gym, walk, and fly most of the time--though not all the time. The Garmin is co-existing with my other watches and I even bought my first automatic watches (Seiko SSK003 GMT and Islander Republic ISL-140) after I had the Garmin for almost a year.
In the end, the Garmin smartwatch just became part of my regular rotation. To me, that's probably the best possible outcome.