It doesn't need a bump stock to have controllable recoil but saying it wouldnt be effective in any way is handicapped.
Full disclosure: I have never fired a gun before, but there are a wealth of people that
have, who claim bump stocks have no functional utility because of the absurd recoil you get. Rally, who is by no means a gun control advocate, has made that exact same claim in this thread.
I don't think bump stocks should be banned because I don't think it'll actually be effective at curbing gun violence. If you can mimic the same effect as a $800 stock using a couple of rubber bands, then legislating on the $800 stock is pointless because it's trivially easy to create an illegal version of it. Whereas making a hand grenade requires some level of expertise and certain materials which are easily regulated.
i really dont get the impression that people understand that any benefits you get from shooting faster with a bump stock are completely lost due to the atrocious recoil control and repeated need to reload
I think the gun-control angle to that exact point is that the recoil control isn't an issue if you're, say, firing from a tall building into a music festival.