The 2.4.1 PTR patch notes
seem to indicate that the new Legacy of Nightmares bonus is super effective. Pretty much every six-piece set in the game is getting huge damage increases (notable exception: Monk Inna, but the Shen Long fist set bonus damage is increased from 100% to 150%, and the spirit gen Inna build is top of the Monk leaderboard).
For those who can't see the link, here are a couple examples from sets I currently enjoy playing:
DH Unhallowed Essence: bonus damage per point of discipline increased from 20% to 40%
DH Marauder: bonus damage per sentry increased from 300% to 400%
Crusader Thorns of the Invoker: 2-piece bonus increased from 25 to 50% additional thorns, 6-piece bonus damage on first attack increased from 600% to 800%
Barb Wrath of the Wastes: damage reduction during WW increased from 40% to 50%, rends do triple damage
WD Zunimasa: pets bonus damage to enemies hit by mana spenders increased from 800% to 1500%
They're also redesigning a couple of legendary gems that used to be cool but got superseded by newer gems (Efficacious Toxin, Pain Enhancer)
I do not understand what I do. For what I want to do I do not do, but what I hate I do.