When most of the stuff that you type are numbers then numpad makes more sense than top row (also, many non-english keyboard layouts have numbers in top row shif

When most of the stuff that you type are numbers then numpad makes more sense than top row (also, many non-english keyboard layouts have numbers in top row shifted). For POS and similar applications it actually makes sense to design the UI such that it can be used only with numpad, for example by using +,-,*,/ as function keys for common operations.