I had a teacher who was a great player and he once demonstrated how "loose' his hand was - there was no muscle tension inhibiting movement. This was the result
of years of playing. He also had great independence of finger movement.
   I would also say that breadth of hand may be as much a factor as finger length.
   Unless you are a soloist, who notices a missing bass note etc?
In fact, less is often more is my philosophy.