Fair enough.
@pineteam, yes, although as I say PM can be very busy looking in other places just after exiting the runway. Without the actual call that Check Airman uses, it is helpful for the audible click to join the "things to do" list in PM's brain, without them having to constantly look down to see when PF has disarmed the spoilers - PM can look outside and do other things until they hear the click. Our SOP's used to have PM switch over the landing and taxi lights, so it was important for them to do so straight after PF had "called" for the scan by clicking the spoiler disarm.
We used to 'click' the spoiler arm up as well, on approach
I imagine Airbus designed it to make a noise, since it is not necessary electrically for a switch to do so.
But no control ever needs to be smashed.