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Re:The growing body of evidence that digital distraction is ... by nitemice on Monday January 08, 2018 @05:15PM (#16101241)
Your last use-case is sort of covered by Android's screen pinning feature[0]. You have to enable it in settings, but it's useful, and seems to work well.

[0] https://support.google.com/nexus/answer/6118421?hl=en This link is for Nexus, but I think it's included in all version of Android since 5.0 Lollipop.

Re:The growing body of evidence that digital distraction is ... by Nition on Monday January 08, 2018 @08:22PM (#16102649)
iOS has this too, it's called Guided Access.