Same logic Riot always uses... overbuff something... break it... rework it. They simply refuse to admit when they fuck up.. and revert things.
Old IE with 20% crit damage and only PD to work with was a balanced item.
ADC's back in season 1-2 running Boots/IE/PD/PD/BT/LW were balanced.
Riot just started adding dumb shit like the new runes... RFC/SS ect. Also the removing of dodge.
In season 1-2 pretty much any champ could be played. Now we have 60 more champs... but only 1/3 of the total champ are even worth owning at any given time.
Remember folks there was a time when AP Sion and old OLD Taric ulti were considered OP. These days AP Sion would get 3 shot by an ADC and Mundo gets a 100% heal ulti.