Most apps that claim to have a minimalist UI don't, they just copy some of the visual styles that Apple use and call it "minimal".
That screenshot you have up there isn't minimal, it's cluttered and confused:
What I'm saying is, apps like this are a mess, adding features to them won't change that. They're not using anything people could legitimately call minimalist design and so there's nothing to lose by bolting things on.
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