Should certain Champions be disallowed from buying specific items?
My last match had Vayne dealing over 15k true damage thanks to having a Guinsoo's Rageblade, which makes her Silver Bolts absolutely broken. Given how it works, Riot can't change Guinsoo to not work on Vayne without screwing it up for other Champions as well, like Kog'Maw.
It reminds me of the old DotA All-Stars days where two heroes, Vengeful Spirit and Pudge, were forbidden from taking an item called Kelen's Dagger of Escape, which allowed the user to blink to a target location. These two were banned from using Kelen's Dagger because they could use an exploit to trap an enemy on unpathable terrain.
I have to wonder if certain Champions, like Vayne, should be given specific bans on items they can purchase. Would this help balance things out by preventing a Champion from taking a gamebreaking item combination, or would it go against Riot's philosophies?