So, you are someone at Riot on the balance team and are tasked with making non adc bot stuff.
Whatcha gonna do? I honestly can think of a way to make non adc bot lane stuff work without gutting the adc (not a fan of that option), making champ or item changes with 8 pages of fine print to avoid misuse and abuse or making everything else so disgustingly strong that adcs won't be an issue anymore because everyone will. Why not just tone down the super murder damage in the game so people can bring something else down bot?