Tenacity should be given as CCR items for tank users.
The only item that provides tenacity and it is the boots
Sometimes I feel like Riot lacks ideas about tank items because they are too busy with buffing the overpowered champions already so they can keep earning money off their "op plays" in worlds
Tank items in game are rediclous, they should provide many tank items that make the tank users feel confident building, just like how confident assassins are when building lethality, just like how confident Marksmen are when building crits or attack speed, same as how mages and supports building their normal build path to do their op damage in game. Juggernauts are doing great so far, and the only role that is a complete crap is tank because you can NEVER be a tank when everyone can melt you down.
There are so many executions in the game, so much % hp damage and so much armor breaking abilities, aside from the items. It is impossible to accept being the tank of late game. It is a crap role and League is losing its rank because of the unfair situations happening right now.
The only way to counter it is to build damage items so you can be a "threat". Other than that, there are no items that give DPS. both of Sunfire and Thornmail are complete crap, their damage can be countered by Doran's blade. Yes I am serious, 3% lifesteal can own that disgusting amount of low damage from Sunfire and Thorn. It is not just that, but they need a lot more tank itemization that provides a lot of different plays. Especially vanguards, because they are the play makers they are the battle callers, they are the initiators and they are usually the "monsters" in late teamfights but they don't feel intimidating at all. Pyke is 10x more intimidating, he can never die, and as a support, he has the ability to penta your team.