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All of these are small things.

Which is exactly the point the original poster was making. Software development on "simple" consumer apps is death by a thousand cuts.

It seems amusing that developers, of all people, wouldn't realize the power of exponentiation: https://en.wikipedia.org/wiki/Wheat_and_chessboard_problem :)

Lots of small things can add up to a lot of work though. A few extra percent per feature of complexity will ramp up quickly.