The irony is more so the unnecessary skeuomorphism, that, inside of a machine that is a strict superset in capabilities of another, simulates the limited interface of the latter machine to make it “look and feel” as though it be an actual calculator.

Obviously, a prompt that accepts arbitrarily complicated mathematical expressions and returns a value is a far superior interface than clicking on buttons with a mouse, but skeuomorphisms in design are very common place, in spite of their lesser efficiency.