SotO was a high risk high reward item
It rarely saw any use in ranked and mostly was bought for messing around -Gets removed
Mejais is a legitimately viable item on champions like Lux and Janna who have a very low risk of dying -Acceptable item with no abuse cases that stays in the game
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Both items created with a risk factor as a deterrent to keep players from making stupid mistakes with them
SotO had virtually no abuse cases and worked as intended Mejai's loses its intended risk factor on certain champions due to their kit design and is therefore far more effective on them than intended Not only that, but these champions tend to buy the item even if behind, when have you ever seen someone buy SotO when behind?
"Oh and we added this item so you can start your snowballing even earlier xd" http://puu.sh/lksFO/c5f8f290f9.png
[TL;DR] The point i'm mainly trying to make here is: You can't have one in the game without the other, it's not fair to one class to remove one without removing it's counterpart. I don't really care about having SotO in the game, just remove Mejais with it too.