[johncostella]

Right. Fundamentally, Magic Kernel Sharp seeks to be an efficient but good approximation to a rectangular low-pass filter; it doesn't add information, and ideally doesn't destroy or distort it either.

Yes, I have seen other methods for guessing or dropping in extra detail. (Indeed, my old "UnBlur" method of deblurring effectively makes a best guess as to what an image looked like before it was blurred, which in the presence of noise is always a selection of one particular possible solution.) There's nothing wrong with that — it's just a different operation.