It is, but that does the opposite of encourage passive play which is one of the so-called "arguments" against flash. Disliking get out of jail free mechanics is one thing, but frankly many champs already have this (cue eternal crying about Vlad pool), and without it people will just tower hug forever like they did when Eve could stun for fear of a Nunu or Fiddlesticks popping out of the jungle. The only way flash can be removed without incentivizing passive play is basically disallowing anyone with any CC at all from jungling. And everyone will just run ghost.
Flash at least succeeds in creating interesting plays with its offensive uses as well. Annie, Fiddlesticks, Urgot, Amumu etc can all do really awesome things with flash that aren't just escaping.
Harassment is pretty pointless with flash. Also, in every major tournament 10 flashes every time. Also, Vlad's pool isn't really free and doesn't give him additional mobility. Really it comes down to would you have taken 20% of your current health in harassment if you hadn't pooled. Yes, alot of stuff would have to be changed if flash was removed, that has been established. Ghost isn't as drastic as it isn't a blink and is still vulnerable while ghosting as opposed to flash.
So a Patch Preview popped up a couple of days ago. Apart from Kayle's rework, Trynd's getting a Rage Bar, TF and Panth lose their global ults, and Galio's getting more tanky.
Kayle-never played as her, but I heard that she was way too item dependent to play. Where most champions rely on skills (AD carries sometimes excluded), she needed her items to be good. I'm glad they did the rework.
Trynd-Um...not sure how this will play out. It makes sense story-wise, but necessary/game-changing? I don't know.
TF/Panth-Glad and upset. Nothing frightened you more than that glowing orange dot above your head that meant "GTFO OF HERE AND GET TO THE TOWER!", and if you were out of position, you were doomed. Panth's was too long of a charge up. You could run out of there well before he landed, but this does make the champions easier to counter. Seeing an orange dot above your head when you definitively know that TF's in bot and you're top, you don't even care then.
Galio-he wasn't tanky enough?
Kayle's rework was a nerf. Any champion going into late game build is going to destroy and carries are fairly item dependent. The new passive was one already known to be buggy due to how it works. Armor/MR reduction % outside of Void Staff and LW are known to be buggy as the shred is limited to base armor/MR which is fairly pathetic.
Alot of the high up Trynd players are complaining but the changes need to be tested before making a judgment call.
TF and Panth's Ult problem was not the ability to catch people out of position. Rather TF with half decent map awareness ports and BDs. His ability to take down towers and waves unopposed is incredibly high. Panth was weak so his ability to leap was hardly impressive.
Galio was (and still might be) considered very subpar compared to other champions as his tanking is completely relient on a combo of flash + Ult. Other than that he has no real way of getting people off his team as opposed to Alistar and Amumu.