Just a few things I'd like to comment on:
Even back than, there were people who complained about fan (including leafies), although they were not many.
Besides, it's understandable why not many talked about it, because it was a weapon that everyone could use for a small stat points investment,
so you couldn't really argue that it's not okay, because everyone could have it too, meaning there were no real disadvantages here.
(Mind you, back than fan Used to be a 1 tile long which is basically like a swinging a sword with knock back, you had to either run up to them to cancel a long cast jutsu, or use flicker and stop their jutsu cast. My point here is that it was more limited back than, and obviously didn't have the new fans)
On a personal Note, I'm just so disappointed that in almost every new weapon or jutsu or anything that is related to pvp that we came up with, instant cc is included, and the pvp relies on that too much. and it's frustrating how everything surrounds over that.
Not a long time ago I said I'd be making a post and maybe even a video talking about instant cast cc jutsus, So I guess I'd be trying to make it just expressing my thoughts on it.
I think almost everything you said I agree with, but the main thing we need to do, like you mentioned is to ask @Ueda for his vision
and have an open discussion about it. cause otherwise we can be talking about this forever.