Kled's Q pull range decreases as the ability channels.
Can the same be added to LeBlanc?
Sometimes if feels impossible to flash out of the range. With this addition you'd have to wait for it to be as close to rooting as possible before flashing away.
If you flash too early you won't get out of the range and if you wait too much you'll get rooted before you can flash.
I feel like this is a fair nerf, since the E already slows you and she can walk or distort towards you as it channels. Also, it won't change anything if she manages to get a point blank E.
If it's too much of a nerf she could also get a compensation buff. And maybe it could work only on her E and not on the mimic.