A lot of ADC's are getting nerfed and/or changed when they see play. i.e; Varus and MF.
Meanwhile 
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Huh he just got a little nerf on the ult slow duration, as well as DFT getting nerfed.
Doesn't seem much on paper, but for sure his popularity went down.
It's almost like he got nerfs or something...
seems to be the 
of adc atm.
Jhin got nerfed both directly and indirectly though. I could link you the patch notes for those nerfs if you want.
Are we really pretending that Jhin never gets nerfed?
If someone gets the splotlight and Riot doesn't like that champion, in 2 weeks he/she/it's gone. But if it's someone they like, "hey we're gonna apply a small nerf and keep watching". -> 5 seasons later, still outclassing everyone else.
It's kinda sad that Riot's mentality for balancing champions is to buff the strong ones without even looking at the weak ones. If only 3 adcs are viable, maybe the rest of them are weak, and could use buffs.
At this rate all the adcs will be doing less than support damage by season 8
They want to get back to bot lane being a 
and
show
It's just because the meta favours him, he's fun and he has utility in a game where "ADCs 2k17 lul" meme is going on (although unjustifiable), hence the pickrate, and it's the meta of heavy damage low CC jungle and mid assassins for a while, so the team needs to get that utility somewhere else and only one of them can pick Jhin, hence the winrate.
He's the 3rd lowest winrate ADC and has no mobility making him extremely easy to kill/shutdown, why are people so salty over Jhin