Stiffness!

tony22 said You'd like to hope someday in audio something WOULDN'T matter!
Years ago I studied harpsichord. Someone once asked David Jacques Way, for many years the owner of Zuckerman Harpsichords, whether it really mattered if a modern harpsichord builder used plastic to make some little parts that were made from wood in the 18th century. Mr. Way replied "When you get enough things right, everything matters." That sentence has stayed with me and it seems to apply equally well to this audio hobby.