> It's sad to see F-Droid using the now-standard design convention of categorically refusing to draw lines between things.

Where exactly would the UI benefit from "drawing lines"? I'd say the visual hierarchy is rather obvious.

I'll say more: most separators people use in their UIs are completely unnecessary. They should be used sporadically when you don't have a better way of segmenting the interface.

> No visual differentiation between sections of the UI, no clear indication of what's tappable and what will happen on a tap

What section of the UI are you referring to exactly? From the screenshots in their blog post it seems to me like the visual hierarchy is preserved and without using the app at least I can form an immediate expectation as to the function of each button. (And what is clickable and what isn't)

> no indication of scrollable areas beyond content being cut off

What type of indication would you like to see here? I think most users intuitively understand that visual cue. An always-on scrollbar would introduce unnecessary clutter..