PSA: Courage of the Colossus was not specifically intended for engage tanks
I keep on hearing this from people on the boards, and I've gotten tired of it.
Rioters have already said that it's intended for anyone who feels like they need the windows of tankiness that it provides. They have even specifically mentioned it being fine by them if Riven players are using it.
Stop asking for nerfs that make it unusable for anyone who doesn't build 3+ tank items. Riot doesn't want it to be stuck to one class of champions (btw that would potentially make it super snowbally and impossible to stop a tower dive). They originally hoped that each champion would have several keystones that they could use to help them in various matchups. This is a step in the right direction, a tanky keystone that can be used by squishies.
Edit: Gotta love random downvotes :D
is using it and being successful with it. It should be based more on bonus health and have lower base stats on the shield.