How can they call anything balanced when people scale with defensive stats?

Pick a damage champ. Build a damage item. See damage increase.

Pick Tank. Build Tank Item. See toughness and damage increase.

They are literally getting twice as much of an effect from the same item. That is the definition of unbalanced.

Originally the concept of high defense characters fought was, "I will build defensively, allowing me to deal a lesser amount of damage than if I built damage items, but it allows me to deal that amount for a longer period of time."

Whereas damage oriented characters worked by " I will do a higher amount of damage and try to kill my opponent before they can kill me."

Right now with people like Volibear and Mundo it is "I will build defensively, dealing the same amount of damage as if I built damage items and allows me to deal that damage for a longer period of time."

OR simply "I am Dr.Mundo. I press E and gain the equivalent of all your damage items, but retain the effects of my purely defensive items."

What. The. Fuck.

Ability power gives you... damage to abilities. Attack damage gives you damage on your attacks. Health gives you health.*

*Unless you're a tank, then it gives you all of the above.

EDIT: This isn't even factoring in the fact they get higher base stats than everyone else aswell.