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.
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.