> If that's the case, then why does the FSF require scanning a printout with a physical signature (as one commenter mentioned) instead of opting for a digital signature of that document?

I dunno, ask the FSF what their reasoning is. Among the numerous plausible explanations is that they are concerned about laws in some non-US jurisdictions, or that they haven't expended resources examining other options.

> Does case law pertaining to the laws you cited support the assertion that digital signatures have the same legal meaning as an electronic or physical signature?

I didn't assert that case law made digital signatures equivalent to electronic signatures (in fact, I explicitly pointed to one way in which it is possible for a digital signature to fail to meet the similar requirements in UETA and E-SIGN for an electronic signature.)