Im a "customization nerd" specially in PvP situations and i must say Azerite Essenses offer to this game more customization than ever before since maybe Wrath of the Lich king.
As a "customization nerd" this is the most fun ive ever had in a long time.
Best addition to the game in terms of fun customization (PvP for me, dont know about you PvE friends).
Things i did so far as a Demon Hunter in PvP
1) Versatility Immortal Tank (Conflict and Strife + Aegis of the Deep)
22% Versatility from items alone + weapon enchant + Azerite essenses
You get around 30% versatility and if you are stunned you take 30% reduced damage.
You laugh at people who stun you.
2) Tank in DPS meters of Battlegrounds (Anima of Life & Death + The Crucible of Flame)
Insane AoE damage.
Sure this is "cheating" the damage meters, all you are doing is AoE'ing the enemy team at the right times.
But is fun playing damage meters in random BGs.
Finished in 3rd place in my last BG.
3) One Shot Macro Havoc Demon Hunter (Blood of the Enemy)
Dark Slash build with Saltwater Potion & Trinket & essense use & 3 chaos strike azerite traits.
70k's Chaos strikes
One shots most people in random Bgs
4) Ka-me-ha-me-ha build (Essense of the Focusing Iris + Blood of the Enemy)
If your class has any kind of crit chance steroids...and you use Focusing Iris after the crit chance improvement..."gg" you just used Kamehameha Kaio-Ken x100 on some poor bastard.