I feel like Morellonomicon crowds out sustain champions

As a mage main (where my mains at?), it seems pretty plain to me that poses a huge roadblock to sustain champs by being both the most potent Grievous Wounds effect (it last sooooo loooooooonggggg) and by being basically the best AP item for DPS mages in the game. Sure, is the highest AP item and eventually the "best" but means near-endless mana, the highest CDR of any high-AP item, a massive amount of AP, plus Grievous wounds. And it's all on an item with an easy build path. It's practically a must-buy item for any AP champ looking to deal damage.

A few champs such as and get hard-countered by this item because they rely on being below half health to make their kits work, which means they have 15% max hp leeway to utilize their kit before even a stray bolt totally screws them for 8 entire seconds. I think it's silly for my must-buy all-purpose best-in-class item to totally shut them down without any trade-offs suffered on my part. I don't see any great reason for it to work this way. At least an AD champ has to pass on up to 15% bonus damage from to get .