4 is much better than 5, but for me in order of importance:
the absence of the widget is a glaring step backwards that ranks as #1 for me. And I think the widget is problematic (no transparency, really? - and I don’t want my ad-counter to drop down to decimals, I want exact numbers); but not having it robs me of seeing it work and giving me instant knowledge about what’s being blocked.
the absence of DNS controls. Why remove a core feature?
the old UI is not only more attractive, it’s a billion times more useful. The current UI is Apple-like… made dumb so that any idiot can use it. I understand why you’d want any idiot to be able to use it, but this kind of app has a different user-base I’d guess. I want control and power, not an on/off button. Some of the options are not well-explained.