I remember who said that, even if you just draw a circle on the document, as long as you draw it and I can prove that you drew it, then the circle is your signature and the document is valid. Of course, this statement is somewhat exaggerated.
Chief executives review many documents and sign many names every day. Their "scrawled" (fancy) signature is to prevent others from imitating it easily, which has a certain degree of anti-counterfeiting function and is fast to write. Imagine that the name of a company boss can be easily imitated, and it is not easy to be signed? Isn't it tiring for the boss to sign documents and write names one by one? Not conducive to work.