The main point of a proper keyboard is that you feel touching the key before you activate it. I do not see the point in haptic or similar feedback telling me that I pressed the key: I know I did, I can see the letter on the screen. What a shame it is the wrong letter though, because I did not feel it and could not make a correction before the OS decided to take my searching for the right key as a key press.

A bubble keyboard has a potential to address that issue. Of course it also has a potential for screwing it badly but let's be optimistic.

But there is another issue. I have yet to see a good on-screen keyboard. By that I mean one with a good layout. The Sailfish keyboard is downright horrible. The default Android one is a lot better and the hacker's keyboard on Android is even better (I do not know about iOS) but they all suffer from the same thing: none of them have a full set of keys. Ctrl, Alt, Alt Gr, cursor keys, numeric pad, function keys... They are all of the "let's make the best out of the bad job" kind.

Can a bubble keyboard fix that? Not unless you can pop up the bubble anywhere on the screen, allowing you a virtually any layout under the sun. And of course not activate the button until I damn pressed it. Fumbling around over the bubbles should have the same effect as doing the same on a real keyboard: absolutely none.