> My guess is that today this would be the case for any computer user, Windows or MacOS.

Not for everyone. I could probably get by fine, if slowly, if you took away my trackpad. I can navigate with full keyboard access and shortcuts, and VoiceOver if necessary.

> The simplest example I have of this is using the volume switch to take a picture, nobody does not.

I do :( It give me feedback on whether I took the picture or not.