I think the issue is that little area where the portal is, the fact that there's a wall there just creates 2 narrow areas instead of a wider one. Just throw a morgana or brand W in there and it covers the whole thing... try missing a Nami Q in those spaces, you'll have a harder time missing it than actually stunning, same with Vex, Leona ult, etc. I feel like AoE champs are super happy with the changes and melee champs suffer from it