For starters, the team has plenty of peel to keep him safe, as well as numerous shields (Ori E, Leona support items).
Secondly, my team comp has absurdly good engage, and should be able to pick off one or two priority targets before they can get anywhere near Jhin. Unless you think they are trying to walk right past the CC hall of pain to get to him.
Sure, if they got a flank off, it could happen, but the same goes for LITERALLY any champion in the back lines.
I'm not sure if you're just that knowledgeable being lvl 22, or just a smurf trying to rile people up with intentionally bad reasoning.