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There are cases where I very much prefer a declarative style. Multiplying matrices for example. Depending on the context, I will know what it does conceptually, but don't want to see the implementation, as it probably won't matter. My rule of thumb is: are you doing something unexpected ? show the implementation : show the concept

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How often do you actually write out matrix multiplication in the main code flow? Generally you extract that into a function and just call it like `matrix_multiply(A, B)`, which in language which supports operator overloading could be attached behind the expression `A * B`. It's not that loops aren't happening, but the loops are just wrapped up in another expression that is more semantically meaningful, which is a good practice in general.

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