Okay first in foremost no he does not need a nerf, it's always the same with some people when complaining have you actually played the champ? Seriously go try him out see how far you get not far people that play him good are good cause. Of practice not the champ because he is easy to counter, ignite and a long range player all you need his mobility is shit that is why he has cc but it isn't a guarantee and on cool downs not easy to take on two players though it may seem like it on the other side it isn't, also don't do dumb moves that is why they call you a scrub obviously know what you can get away with with your opponent if you are fighting a swain don't be dum enough to fight him on a full life unless you know u can burst him down.
He doesn't need a nerf cause his kit is fine if you want to talk real issues talk Darius op as hell or any of the other overpowered favorites seriously I'm tired of people complaining on forums about him you realize why he isn't picked often is because people don't take the time to learn him his kit may seem straight forward but it isn't it's a bunch of give and take so to end my point Idc how over powered you think he is if I have to deal with a Sona that deals dmg like a mid and still can support effectively or a Darius that can clear your life in basically one move and a jinx that heals faster than me trust me the list goes on then you can deal with learning your opponent cause out of all that I listed and the ones existing along side those swain is definitely not the issue.