"I hope once Likables and Denso goes live they will be proof for the production-worthiness of the 4-pixel rhythm. I also hope that Apple will see this and perhaps reconsider the visual proportions of UI in future iOS versions." doesn't match what you just said ;)
What I'm saying is that "You can look at a 4-pixel rhythm as 8-pixel, 16-pixel or 32-pixel. 4 is just the lowest basic unit" doesn't improve upon our situation. The lowest basic unit is called a pixel. Grids make everything look consistent; but when the only requirement is that you snap to 4-pixels, things aren't going to look consistent, because you have far too much flexibility.
What I'm saying is that "You can look at a 4-pixel rhythm as 8-pixel, 16-pixel or 32-pixel. 4 is just the lowest basic unit" doesn't improve upon our situation. The lowest basic unit is called a pixel. Grids make everything look consistent; but when the only requirement is that you snap to 4-pixels, things aren't going to look consistent, because you have far too much flexibility.