> So the engineers came up with a power-user shortcut… and since the Shift was a natural counterpart in the Caps Lock world, it could also do the same here!

> The solution: you could hold Shift and press the arrow/numeric key to quickly reverse its current mode.

One person's "ingenious" is another's "confusing due to lack of clarity". If I hit some keys that weren't numlock and they caused my numpad to behave differently than the mode I expected, I would not think "oh wow that's so clever", I would be confused about what happened and probably not understand how to use that mechanism from observing the surprising behavior.