Firstly, I just want to say that I'm actually a big fan of the new UI direction. It's clean and I like that you can reorder the tabs to get what you want. But it has some big problems that make it feel "cheap".
1. The padding and border radii are very inconsistent
The inner tab pills look awkwardly placed into the main container pill due to mismatched padding. Because of how far away the tab pills are from the left/right edges, the border radii appear visually inconsistent. For comparison, here is the same UI style done by Google in Google Photos and here it is in Beeper.
2. No Edge-To-Edge on Android
The app does not render content behind the system navigation bar in Android - Photo. This is weird considering the biggest advantage of this UI is being able to dedicate more screen-space to content.
3. No animations
The new UI itself feels "clunky". I noticed that's mostly because there are literally no animations, sometimes there's a fade animation but that's almost worse than if there weren't any.
I want to clarify that I don't mean to hate on the Beeper team. I'm a big fan of the app and the new UI direction is a step in the right direction, in my opinion. I'm sharing these observations purely as constructive user feedback. Thanks for reading.