I think we'll see Garmin Connect “super, newer, faster, more modern” before they get up and running.
I cross about 4 segments on my route to and from work (two I have created). Yet in the segment section on my ride details I never seem to pass through a segment ever! Garmin has a long ass way to catch up with Strava or even MapMyTracks in terms of segments.
I think Garmin’s segments could be better than both Strava & MMT’s with adding in the weather details etc but like most GC stuff the implementation is never matches the promise in my view :)