So, um...

Remind me how we can pretend attack speed and ADC items are fair in any way when even AP champs, tanks and supports can build them and hard carry?

Like... if that's not a red flag, I don't know what is. I can tell you that full AP Janna isn't going to carry anything, nor is AP Sion. But if you build AD / AS on them? Well, you do just as much damage as an ADC, if not more.