There are so many stronger picks right now. I mean teams are letting Graves, Ezreal, Udyr, Malphite, Blitz through which are all more ban worthy to get rid of a rather weak in the current meta pick for no obvious reason. What is the point in banning 
?
banning isn't always about removing champs you dont want to face, sometimes you ban to remove a champ your team will feed with. Such is the case with jhin.
So my teammates won't pick him.
He's just annoying. Jhin can be harder to fight than a passive caitlyn. He has crazy range and relies on his support to set up a stun on the enemy just so he can W double stun from a distance so he can come in and clean up with his crit auto attack. He sucks if he gets caught out, but if he plays smart he can be one of the most annoying champions just because of his range.
You ban him away from your team, not the enemy.
Ranked play is all about consistency. You want to utilize the most reliable and consistent strategy to win.
Having a new champion in the game isn't consistent or reliable: you don't know how terrible anyone on your team that wants to pick him is with him, and you don't know how much practice anyone facing against an opposing Jhin has against him and how easily they'll get surprised or caught off-guard by a halfway decent one.
Despite how strong certain champions are in the meta: it's pretty common knowledge a first-time Graves is going to get thrashed by an Urgot main, and a Silver Graves will get thrashed by a Plat Urgot. As such, removing the 'woops' factor for either having no idea how to play as or against Jhin is going to improve your chances of winning much more than banning out that one guy that's 0.5% stronger than that other guy in that top 15 meta-picks crowd.
