Why tank metas are the healthiest
All the items they build are useless in the late game (armor pen, %health damage items, true damage, armor shred, etc). The amount of things that screw tanks is just incredible. In other metas (mage meta, assassin meta, adc meta, etc), the same items that counter those champions are the items that tanks build. Like, you can itemize against mages and assassins, but the same defensive items (armor, magic resist, health, etc) you buy against them are the items that counter tanks. Also, tanks are by far the riskiest champions to play. With most of these champions, once you go in, you have NO escape. You have no stealth, no instant repositioning abilities or untarget abilities (Evelynn, Zed, Fizz, etc). Yes tanks are strong when the meta favors them, but you know what? I'm okay with this, because they also have the most counterplay.