The next big update after the runes reforged needs to be an "items reforged"
Items as a whole need a sweeping update. From items that have such an extreme niche it can sometimes cause a make or break balance for a singular champ or there have been points of if you are in a certain roster group your power is tied to the level of synergy you have with item(s). There have been and likely will continue to be issues of items meant for one group being abused by an unintended group. There are some stat pair groups that there aren't enough of. There are some items that don't have counterparts for other champ types that there should be at least one for. I am sure there is more issue's and I know for a fact that a significant number of the community would have suggestions/a wish list for riot to go off of.