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TL;DR AT THE BOTTOM
There has been a lot of discussion on this subreddit regarding Vex's anti-mobility nature and whether it's true or not.
Whenever there is a thread claiming that Riot did not reach there goals there is always a top rated comment claiming that Riot did infact succeed in creating an anti-mobility champion because her winrates vs high mobility champions reflect this. What I want to address is why there is a disconnect between community perception and winrates.
The answer is quite simple, taking a look at winrate of a typical long range mage over time versus Vex and a typical winrate over time of a high mobility champion of Vex reveals the answer.
The way Vex operates as a champion is that in-lane she counters champions who frequently allow her to proc her passive and her kit is unable to interact with long range mages in lane, as the game progresses her fraily and succeptability to dive becomes apparent and her bursty nature gets enhanced which results in that in the late game, she is countered by champions who have high mobility who are able to dive her even after being feared and long range mages who have no mobility find themselves succumbing to her high burst damage combo that is hard to dodge.
Vex's winrate over time versus Vel'Koz
Now let's look at Irelia's winrate over time versus Vex
You will find this pattern with all long range mages and high mobility champions to higher or lesser degrees, it's just the nature of the kit.
TL;DR Vex counters mobility champions in lane and is countered by long range mages in lane, late game this FLIPS around and she counters long range mages (low mobility) and gets countered by high mobility champions that are able to dive her. 4/5 players on the map don't lane vs her so they only notice how she operates out of lane.
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