Essence reaver is literally the stupidest item in the game now. Rito didn't learn that making two stats scale off of each other in 1:1 ratios will inevitably result in it being abused and it shouldn't be done. They did it with Azir with CDR and AS, they did it with Yas by putting crits on crits, and they decided to merge the two, because that would totally be a good idea, and decided to put CDR on crits.
You literally can get 30% cdr from that item and a zeal alone, alongside the ad, as, and 40% crit those two together provide without that stupid passive.