Why is it so god damn hard to do the same to other things?
Banner of Command was either too good or too bad, so they removed it.
I rarely see anyone buy Duskblade anymore because it was really nerfed. If they were to buff it again, it would go back to being broken.
Stormrazor gives a stupid high burst early, but falls off and is useless later on.
Dark Harvest gives way too much easy extra damage.
Why not just remove them? If Riot has to try extremely hard to get something to work, it most likely isn't a good thing. Just straight up remove them, like you did to Banner.