Why is all new legend gear again worse then old

[kickazzrogue]

I don't understand why sts keeps coming out with worse gear than what we already have ancient ice and epidemic are still best and really old. People are still using cobalt night ocean these rings are like over 2 years old I don't understand why we are not progressing. endgame is constantly progressing and low lvl gets worse and worse. All the new bug gear is horribly worse then old stuff. A explanation would be nice as to what you plan to accomplish taking steps back.