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This is probably easier for heavily procedural subjects, like math and meditation. Note that math instruction is already a lot like this, and doing exercises feels like "sitting down to do math".
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That suggests to me that it's not the app format but the procedural nature of the domain. Sitting down to meditate or to do math is easier, and is straightforward to offer in app form. See also a million popular exercise apps. But how does one just sit down to do history?
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(I actually spent a bit of time thinking about that question, when doing my MSc thesis on educational games. It looked to me like gamification is easy and effective for math, where you can automatically generate questions and verify the answers.)
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my humble two cents as user/someone who learned english largely from videogames, is that educational games never took off because they still operate under a sort of classroom mindset and "work" by "making learning fun/interactive" rather than making learning incidental
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