I asked mainly because I think my distance increases have come by accruing marginal amounts of snap increase but being physically very powerful and having a well-trained CNS is what propels most of it.
those with high percentages of fast-twitch muscle fibers are definitely at an advantage over those who do not. those who are in shape and flexible have an advantage over those who are not. if you are in shape and flexible you will be throwing farther than if you are out of shape and stiff. those with big hands and long forearms will throw farther than those who do not.
working within yourself, you can get distance increases by changing your physique, but these are usually fairly minor in comparison to big snap increases.
if you have maxed out your snap, then future distance gains will pretty much happen slowly, with physical changes, minor technique refinements, and technology changes paving the way.
overall though, it's small potatoes. if you can move your arm, you can throw with higher levels of snap.