Sometimes a man has to take a chance, and not listen to baseless rumors. This is what it takes to learn about low stretch and old bows. We can't be sure they don't work, until we prove they don't, and in the interim, we may find they work very well on our old friends.
Just be cautionary when trying them, and make sure there are no cracks already started anywhere, and the string notch is smooth, with no edges around its perimeter. So far I have somewhere over 1500 shots through my 67 Necedah with the 450+. Time will tell, but it's like a new bow....and you remember how much of a B50 man I have been. Old dogs.