Earlier quoted context omitted.
There's plenty of jurisdictions where "pasting a scanned signature into a pdf" doesn't produce a legally valid signature. Germany requires some signing software for pdfs - though printed-signed-scanned documents are also legally valid signatures
Show me someone who can tell the difference between pasting a signature in a pdf vs printed-signed-scanned? There was a legislature in America that tried to define pi as 3 so irrational laws are not surprising.
By the way, in Spain printed-signed-scanned wouldn't be legally valid either, unless a notary has seen the original and can certify that it coincides with their own handwritten signature. Otherwise it's either original handwritten signature, or digital signature in a digital PDF file, or printed digital signature with a secure validation code that you can verify in some URL.