A common thing to do (and this generally only applies to top lane Xin Zhao), is that when you snowball really hardcore on Xin, and they are generally fairly squishy champions, is to grab some crit and just obliterate them (Ex: Infinity Edge + Triforce)
The amount of burst a nearly full AD xin zhao can output is actually quite insane.
Edit: Do note, I am not saying that these buffs are a good idea, hell they are an incredibly stupid idea and will break the fuck out of Xin. I am merely stating as to where they may have come up with the idea for it.