Can we talk about Sion

Let me start off by saying by no means do I think all tanks are in a good spot.

Now, having 6k hp with two items on the other hand is a bit absurd. Like I get it. He's a tank that is meant to scale into the game and become very tanky I understand that, but I have seen three item Sions basically 1v3 all damage dealers and just keep that up for like a solid 5 seconds or better. Now in a meta where everyone has nutty burst and teamfights last .5 sec thats kind of a issue. I'm not saying the champ needs to be gutted but can we lower his passive to something within reason?