Thank you champion skin for the exaplanation
So, its better to build armor while stacking HP, correct?. Since resistances scale off HP is what your telling me?
Does'nt this further polarize the game?
So what your telling me with regards to my example is that regardless of having the same amount of armor that 700 DMG shot will deal more damage if you have more HP than less, despite having the same armor?
Now can someone explain to me why this is good?
Why don't they incorporate a min max factor? Like for warmogs I would like a minimum % health regen in case I don't stack HP. Let's say I'm Evelyn and build

In this scenarios all I have itemwise for HP is warmogs hardly benefiting from its passive and yet its my only sustain item.
If it gave a min regen that equalled like the equivalent of having 3300k HP at lvl 18.
Something similar for resistance would be nice, you can only get "gipped" so much for not going the stacking route.
I think its harsh that in order to maximize item uses you have to go all in.
I get it for dealing DMG (but at least thanks to lifesteal their source of sustain also scale along with their damage output, kind of like riven getting a bigger shield for going damage) champion who do not have this luxury of being able to take advantage of polarization are sort of left behind.
I get the need for polarization when it comes to dps but not so much for damage mitigation, paying for the same amount of resistances and getting less out of it because you have less HP.