It's not the "devil's instrument" for nothing!!!!
I play the violin (the devil's instrument!), and I do it seriously. I'm what's called an "accomplished amateur" because I don't have a degree in violin. However, I've been playing for 50 years so I know my way around my instrument! In a couple of weeks when the string quartet of which I've been a member for 20 years steps out on stage and hauls into the a couple of the quartets from the literature, there had better not be any fingernails in the way, whether it's Dvorak or Beethoven, facility is key.
So, the left hand nails are a bit shorter than the right, the right thumb nail is a bit shorter than the left, but they are as long as the instrument will allow.
To make up for it, I take a lot of care in how they are shaped. Interestingly enough, having the nails down to the nubs does not help the playing, as the nails do give some support for the finger pads. It's those issues that have been requiring me, and all violinists (and violists and cellists) to make sure those nails are not an afterthought.
Yet again, being in both genders is a plus!!!
tina