User blog comment:NinjaWolfy11/Discussion: What should be done about the mobility issue?/@comment-1601181-20120906002330/@comment-3974211-20120906142924

Flash is the band-aid that allows the no mobility, no substitute for mobility champions to even slightly compete. Until a fix to the mobility problem is found, Flash is required to make games fair.

Yes, it's unfortunate that mobility champions also take Flash, but that's just the double-edged sword. But in all fairness; Ezreal's, Corki's, Kassadin's, etc, would never use their mobility offensively if they didn't have Flash to retreat with.