As with all visual systems, too much minimalism and too much noise spoil the experience. Ultimately, the context matters a lot. Not to mention the app, target

As with all visual systems, too much minimalism and too much noise spoil the experience. Ultimately, the context matters a lot. Not to mention the app, target users, complexity of the app, and what not. But I really hated those flat, borderless 'buttons' in earlier iOS versions. That's just stupid design. It's minimal for sure, but functionally.