Actually, one of the big problems from back in the day when elo was used as the benchmark for everything was people's attitudes towards other players. For example :
3rd pick : Hey guys! I want to mid please.
2nd pick : F* you! I'm better. Why do you think you're 3rd pick? Mid is my main! Go F* yourself baddie!
These types of comments happened all the time. I had somebody who told me I was bad, had terrible elo, no skills, blah blah... they were 3 elo above me. As in if i was 1254 they were 1257. But by the elo standard that was being shown and held up by the game, they were better because there number was higher.
Now that MMR/Elo are hidden, this is no longer an excuse for this behavior in pick order. All you know in solo queue ranked is that you are around the same MMR. You may have different divisions/tiers, but your MMR is about the same.
I believe they basically hid Elo and set up the Tier/Division structure to try and cut down on elo elitism; if you will.