RPF PREMIUM MEMBER
Because the original didn't use them. They used a colored string, that from every indication was a colored, thin gauge crochet thread.
... and I suggested what I did because I agree with you on this :lol
The original harp had multi-colored strings, and I'm afraid that it will look so different from what we think it looks like that it might be distracting,
Maybe a 'solid' silver colour will look even worse (?). Could turn out to be way too reflective and also looking quite different from the original.
Much as you hate those kind of decisions, the choice is (unfortunately :lol), ultimately yours of course