Why you need MR to live through mage burst, but mage without armor can survive AD burst?
That bothers me and imo its unfair as hell.
Why i need heavy MR items to live through

their burst combo, meanwhile with 0 armor they can just tank rounds from full damage ad carry.
Its just feel stupid when lets say
throws entire combo at
but she survives and one shots him right after.
Can we give a reason for mages to get armor?
get armor per lvl. not all champs get mr per lvl. most get 30 and stay there or end up about 55 mr at lvl 18. also the amount of ap a mage can have is always greater then the amount of AD a champ can get ... its not rare to see mages with 600+ ap at lvl 18 where as most AD champs top out about 360 AD. i assume the difference is that ad is applied via auto attacks and you dont have to hit skill shot or abilities to apply the ad damage. but as mages you typically have to use a skill shot or hit a champ with ability to do magic damage.
last time i checked zhoniya's still has armor