Well, Akali was really powerful back in season 4, and this had nothing to do with "bronze tears". Sure, she had counterplay, but back at time, tanks were unviable, and most champions that could deal with her were nerfed. Also, Akali was mostly played at top, where she could harass other champions with the combination of her Q and her E. She couldn't be harassed because most top laners were melee.
Her shroud allowed her to drain tank everything due to the resistances, which you could not get rid of even with pink wards.
The problem with Akali is that she is too binary. Also, her passive prevents her from being powerful enough since if she even gets a lead, she is unstoppable. She is difficult to outduel if you are not tanky. Also, she is entirely point and click, she lacks counterplay options that are not obvious (CC, pink wards, etc). So she needs to be weak otherwise she is overwhelming.
She needs a rework, to be honest. Get rid of that spellvamp passive, assassins do not need to have sustain to be reliable. That passive is just taking away a lot of her power budget.