User blog comment:Willbachbakal/(Champion Rework) Caitlyn, the Sheriff of Piltover/@comment-25343084-20150906155338/@comment-1330314-20150907183454

Ezreal is one of the most mobile marksmen in the game, even with his cast times. With the above kit, even with her movespeed and dash Caitlyn would be the most immobile marksman in the game, requiring her to ground herself to deal damage. You are also counting Cait's crit damage without doing the same for Ezreal or factoring in basic attacks too, which is heavily skewing your calculations. Because focus requires you to place your cursor on top of your enemy for a certain amount of time, unless you'd want to move towards your opponent there would be no way to focus while moving ( seconds is far more than enough for any enemy to catch up to her, and would require her to build far more attack speed than she could afford). Cait's steroid is not a carbon copy of Jinx's, but again she has a ton of features Cait doesn't, including effects that sound pretty OP too (e.g. critical splash damage or 140% bonus AS). Cait also makes far more tradeoffs too, since whereas Jinx has to choose between sub-par range or crappy base AS (which would be the same as Caitlyn's), Cait would have to choose between even worse range and no mobility at all.

The difference between Caitlyn and Azir is that Azir was never intended to have burst, while the above kit obviously does. Cait makes a ton of sacrifices for her range and burst, including reliability, mobility and pushing power (reliability and pushing power are meant to be core marksman strengths, too, so those are pretty big sacrifices). Azir has access to utility, mobility, defense and overall safety Caitlyn does not have even when Perched far behind the back lines, which is why he shouldn't have burst but Cait should be allowed to.