In a way I don't think it's possible to forge one's own signature.
What's the diference of my signature from the forgery of the signature I did myself?
Signature on a piece of paper says "I read this and agree with what's written so I've put a unique piece of ink there to show my agreement" doesn't really matter what you put there if all parts agree on its validity.
The forging of a signature has always been a possibility, which is why witnesses are required for the important stuff.
On the other hand, you would be right in thinking that there is a somewhat anachronistic element of theater in having signatures on electronic documents.
In some ways, the theater is the point: the more elaborate the “production”, the easier it is to demonstrate that the required “meeting of the minds” took place.
Someone might blithely—-or accidentally—-click continue, but you can’t really sleepwalk your way through signing a document or lining up witnesses to the signing.