I dislike modern "flat" user interfaces which try to remove boxes and lines as much as possible. It makes it harder to get oriented in an app, discern hierarchy, and tell different regions apart. (Maybe reducing boxes saves space, as long as you don't replace them with large regions of whitespace.)

I'm glad that https://raw.githubusercontent.com/derricw/siggo/master/media... has boxes and line separators, and hope they don't get removed.