Double Item Purchase
I believe that champions should not be able to purchase double items. For example, you have removed Ezreal buying 2 Tears of the Goddess. The double Dark Seal item is strong on some champions. As for Jhin buying Several Infinity Edges, the damage output just does not add up. It does not give players the right to play, or the opportunity to counter the issue, if 1 auto from Jhin can remove 2/3rds of a squishy ADC/Support players health even with a bit of armor then it is quite unfair to the opposing team.