Thanks again Falanx. This is the most interesting thread I have ever seen in this forum.
Here is a reponse from a company that makes Sc frames.

Okay...well we are using it in practice and have found it to be quite
true. Our 29 inch is the best example. You just simply couldn't do a
pivotless softail from regular aluminum tubing. It would tear like the
pop can effect. We have also seen off the charts test results on our
scandium stems in direct comparrison to aluminum samples of the same
construction. Believe it or not..scandium is a real deal material. Its
always up to you to decide what you buy. If scandiums not for
you...then its just not fo you. Hope you find something that fits your
riding and research.