I see two possible scenarios for the upcoming tank item/base stat changes
Scenario 1:
When Riot says "tanks" they are referring to only Vanguards and Wardens. Other 'tanky' (Note: NOT Tanks) classes such as Juggernauts, Divers, and Skirmishers that normally only build one or two offensive items then full tank items to survive receive massive indirect nerfs. We then have multiple classes of champions that are destroyed and are doomed to get chain exhausted and deleted in fights.
Scenario 2:
Riot extends the term "Tanks" to include other 'tanky' (Again please note there is a difference) melee fighter classes. This allows the other classes to build more damage without sacrificing as much durability. This leads to them being much too strong as they can pump out more damage while not missing out on as much durability.
, it was supposed to give a bit of stickiness to champs who didn't have any jumps/dashes etc., but what happened instead? Every champion that already had mobility in their kit decided to build it, transforming their mobility from "fine" to "broken op".