Reminder that tanks should have debuffs
Its much healthier for everyone to include this vital part of Vanguard function to be able to weaken enemies. When you just turn tanks into a combination of CC and damage with obligatory defense steroid they all mesh together and only the best 2 tanks are even worth considering.
It helps tanks remain useful during their key downtimes; they might be on CD but they still impact the fight because they have debilitated enemies and made it harder for them to win. Example: Amumu. After blowing his big CC ultimate he spends the rest of the fight making enemies more vulnerable to magic damage and CCing only one person at a time.
Ornn Brittle is good on paper but his contribution of extending CC/countering tenacity is too burst loaded and oftentimes he ends up proccing it himself instead of assisting allies with it.
Tanks are sorely lacking an important fundamental element of being a tank and you're not going to make healthy initiators without it.