Does Riot realize a lot of the games problems stem from the fact no one has any MR anymore?
A ton of champions use to run 12 mr glyphs, or at the minimum 4, and that helped stem all the random magic damage that's been added to league that was balanced around this. Take that away and oh lookie people just exploding quicker than ever. It's why tanks were broken for so long, it's why supports have gained so much power.
Why didn't riot give everyone a base MR increase in the pre season update, it's just so asinine.
and
for MR, there's your 2 choices! Armor? Oh well we got:

hell EVEN
! That's if we don't count the hybrid armor/mr items that is. But really, If i'm facing a mostly full up AP team, 2 full MR items then hybrid, isn't going to let me tank as much as if i face a full AD team.
if you're feeling paranoid.
.
I know you said you weren't counting hybrid items, but 60 and 55 MR respectively are still gonna do a lot against magic damage. Especially locket's team shield.



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