"As I just said with my example, you might not need to write that down, but you do need to enter it into a calculator, which means you will use the multiply button and you will need to enter it in the right order"
But you presumably remember the days when we wrote (as we still do, of course) "sin 90 = 1" but calculator syntax was "90 sin = 1"?
People struggled a bit when they first used a calcuator for trig because they understood the operation perfectly well but they didn't know the syntax. It wasn't that the calculator's syntax didn't make sense, it's just that people had never used it.
You can understand how to count your change without needing to understand arithmetic syntax.
I wonder how many people there are who (a) would struggle with working out "501 - 20 - 20 - 20 x 3" and (b) would calculate darts scores in a fraction of the time that any of us would. I would guess quite a few.