Definitely should not be nerfed. Its a strong gem, but its not even close to being the only strong gem. In fact the clips I show of my build, the Barber may be the most obvious gem, but its not most important, nor the largest benefit to my build. My build worked prior season start (pre / post nerf patch), and the entire reason Im even playin seasons is one Gem that every content creator has crapped on.
Thats not to say, all heart gems are winners. Every single Devious Heart Gem for Rogue is basically useless. I get piece of Devious jewelry its basically an instant sell / salvage, with the exception of god roll amulets.
How the Barber works is that is consumes your damage over a time period, adds a modifier, and applies as an AOE burst. Anything that would normally proc, procs on the burst. You can still apply status effects, glyphs, cc, etc… during the build up phase. Now where it gets interesting, is the damage you don’t apply. Thats hows you get extras in. So other damage that you get from Aspects, Heart Gems, Uniques etc… (not sure about pets as I dont play a class with pets) that does not come from you yourself, will proc.
In the clips, I am applying Vulnerability 3 different ways, shadow damage 3 different ways, stun 3 different ways, chill / frozen 3 different ways that multiplies out to 12 different ways due aspects / gems, daze 2 different ways that multiples out to 8 different ways. As well as constantly cycling in and out of stealth.
If you are looking to proc vulnerability or lucky hit during the build up phase, they need to come from something that does not deal direct damage from you. You need to find away to proc them from damage that does not come from “you” yourself, or find a way that you apply them that does not do damage.
Damage procs that come from you, will be applied at the time of burst if they get proper proc roll. So if the burst rolls a Lucky Hit, you will the lucky hit on the burst. Same for any skill / damage proc that procs off of the burst proc. For example I ran an Execute Build for a few days on the Barber, with something like 50% total chance on weapons, and it would proc consistently on Barbers burst, and subsequent successful Lucky Hit rolls on my builds AoE burst.
For your Druid friend, if they wanted to consistently get Resources back on Lucky Hit with the Barber, they would need high Lucky Hit chance, and it would only proc on the Barber burst and any subsequent Lucky Hit rolls on anything that proc’d off the Barbers burst. Ive not played much of Druid, so Im not familiar if they have something like that, but anything with a good AoE and spreading mechanic should have strong potential. They will still lack in single target resource gain from Lucky Hit, due to the time frame of the Barber.