Why almost every Ligthing Amazon build it's using this gauntlet?

Eternal Youth KP. Leeches ES

Pretty sure those are the ones that convert life leech into es leech. That would be why.

Ummm are they? All the builds I was looking at in the first 2 weeks of this season had nothing to do with this gloves.

ES leech should just be a regular modifier on gloves and rings. It seems like a fun mechanic, better if not tied to one pair of gloves.