Petition to remove Death Cap.
This might sound silly at first, but hear me out. (TL;DR at the bottom, if you don't like reading)
In my opinion,
Is an unhealthy item because it provides to much of a champions total AP.
If you have 300 AP then build a Death Cap you have 537 AP, that Deathcap is 47% of your AP. If you have 400 AP then build a Death Cap you have 702 AP, that Deathcap is 43% of your AP. If you have 500 AP then build a Death Cap you have 837 AP, that Deathcap is 40% of your AP.
Why should one item be 40% of your power? this makes it mandatory to build, if you plan on building any notable amount of AP.
This means that AP champions only really have 4 items slots to customize their build (assuming you get boots) rather than 5, making their builds pretty stale.
It also hurts Hybrid builds as its usually much better to just go AD if you don't plan on getting a DeathCap but its better to just go AP if you invest in one.
A simple solution would be to just give all other AP items a small increase and remove DeathCap all together or just turn it into a flat AP item (maybe like 160). This way, you get 5 items to chose from, but still have enough AP to actually do stuff. Hybrid builds or buying a single AP item on a tank or support could now work.
TL;DR: Remove DeathCap, give all other AP items a small increase.
:^)