Which old devices are not supported any more by Connect IQ?

From this thread on facebook: https://www.facebook.com/groups/garminforum/posts/2752210798472170/ it looks like epix (gen 1) is not really supported any more by CIQ. We can waste our time supporting it, are able to build for it, test it in the simulator, but what's the point if no user can use it because Connect IQ phone apps no longer support the watch. Is it still supported from Garmin Express?

 Can you please clarify the issue? Which devices are no longer supported? Can Garmin indicate it somehow  and announce the change so we don't waste our time supporting them?