Any AP item that gives HP should not give that much AP.
Mage should either choose between surviving for long lower damage extended trades or instaburst but squishy. Just came off a game where Zoe had nearly 2.5k hp but she was able to pretty much 1 shot our ADC with Q + AA. Not a bubble + Q, but a Q + AA.
Either give me a good reason why an AP item like Morellos/Rylais should give that much AP while still providing bonus HP. Attacks on my board posting account isn't my main account isn't a valid reason.
is one of the lowest ap items it gives 60 ap which is about as much as the support item 
does even more ap damage and its a support item.
is a good anti heal item, but in terms of raw damage
has more magic pen
gives you the same amount of ap as well as cool downs and give bonus damage on its passive.
unless your a low mobility champion who needs the extra cc. such as
or 
So in the average full build of a typical mage, they get 1 item that even gets HP. While ADs get BloodThirster which gives them a pretty size chunk of a shield that may as well be more HP, or the fact they can Lifesteal all their HP back and Mages can't, which is a lot of the reason they have so many items that give some HP.