I am unable to snap my fingers. I never really regarded this as any kind of a disadvantage. However, it has been brought to my attention that some people advocate replacing applause with finger snapping.
When I tell people that I can’t snap my fingers, they often try to instruct me. They assume that I must just be using the wrong technique. But to no avail. The other thing I discover is that I am not alone and that other people are unable to do it.
I have been unable to find an explanation in the medical literature. I suspect that it might have something to do with the mobility of the finger joints.