Board Thread:Wiki discussions and announcements/@comment-1990160-20140521040036/@comment-1330314-20140523183713

You are deliberately ignoring my entire argument, as well as heavily misinterpreting it. 1000 health to 2000 health is a 100% increase, congruent with 100 armor. 1000 health to 3000 health is a 200% increase, congruent with 200 armor. There are no diminishing returns whatsoever.

The thing is, if damage reduction weren't to fall off, then buying resistances would cause them to stack exponentially. With hypothetically enough armor or MR, you would reach 100% damage reduction, which means you'd take 0 damage from a certain source. That is equivalent to literally infinity EHP. Damage taken is a multiplier that scales inversely with resistances, so so-called "diminishing returns" on it are just an expression of the linear increase in EHP that you're getting.

The reason most people avoid stacking large amounts of armor or MR is because of or, which scale  with your resistances. It's usually a far better idea to stack health and armor in similar amounts rather than go into full health stacking or full resistance stacking.