A signature has no magic power. It's very simple. If you sign your name on a document, you are stating that you agree with the document. It doesn't matter if you use a feather pen or this guy's script. If you sign someone else's name on a document, it's obvious that you are committing fraud by impersonating them. Again, the instrument used to sign has no bearing on that.

You seem to be of the opinion that since it is possible to forge a signature, it cannot be legally binding.