As far as fingernails go, I can tell you my left hand fingernails cut back a lot further than my right. Over time of keeping those nails short for playing, they just kind of receded or something. The "quick" is much further back than on my right. I'm right handed, so I'd expect the opposite.
But Jim, I'm a guitar player not a doctor! ;)
...so ever since then, I always hang on to the buckle.