Why do magic resist items give so little MR compared to Armor from armor items?
With armor, there are plenty of items that give 70-100 armor, but the highest MR a single item gives is +55, which is 
Even if I use 4/6 of my item slots to build MR items because their 
/
was really fed, I'd only be left with mediocre MR and I'd be destroyed by their ADC due to lack of armor and utility. Moreover, those 4 items would pretty much be countered by 1 
and 1 
Yes, I am aware that there is 
as a counterpart for AD as well, but with AD damage, you're given the option of things that give 9999 armor as well as insane dps-reducing/deterring effects, like 
With MR, you're given 
but what if I'm not an AD champion? The only other option you have is 
but that can be popped by literally anyone with an active skill. Heck, almost all champions gain armor per level,** but there are some champions that don't gain any MR at all!**
I think I more or less know the reason why Riot made MR gain from items weaker than armor, but I fail to understand why. I'm assuming they nerfed a lot of the MR stats because "burst champions are useless when they can't burst" and "AD scales better than AP," but that's not entirely true:
- That's under the assumption that all champions that deal magic damage are bursty, but champions that do heavy dps magic damage exist (
, 
, 
)
By taking away viable MR options (especially for AP Tanks), you're setting us up for a world of hurt - Bursty-assassin types should be waiting and aiming for carries anyway. If they build 4 MR items, then they're not doing any damage
~~ ~~ TL;DR - While there are a plethora of really strong armor items that bring a lot of team utility on top of high armor, there is a lack of reliable MR items that give even sufficient MR
