Originally Posted by overmywaders
Why don't we simply cut out the interim "testing" and try the rod with a variety of lines? That way, the user gets a line that brings out the best qualities of the rod, at the distance the user will fish it, and with his unique casting style.
Because decent fly lines aren't cheap enough to just buy 'em and try 'em. Testing might not be perfect, but it's a better start than what the rod makers often give. Lines might be off a bit, but I doubt they're often off more than some of the rods that even my meager experience his shown (i.e. nearly 2 "rod weights")