In many cases the understanding of the term "touch typing" isn't just "typing without looking" but a very specific way of doing so.

You should be able to type without looking at your keyboard.

But the specific 5 finger arrangement taught often as "tough typing" isn't needed for that, some common issues:

- it being taught with an orthogonal arrangement of your hand to they keyboard, that is nearly guaranteed to lead to carpal tunnel syndrome if you have a typical keyboard/desk setup. Don't angle your wrist when typing.

- Pinky fingers of "average" hands already have issues reaching the right rows, with extra small or extra short hands they often aren't usable as intended with touch typing.