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Last time I changed my signature (before I was a teenager) I had trouble with a bank not liking that I had used a different one to their records. I had to go through a complex process to change their records to my new signature (the old one was just my name written out, like yours, btw).
Banks keep a record of it, so that they can control access to your account (in Britain the banks keep a scanned image on file to compare if you are not at your home branch).
The legal requirement for company documents, FWIIW, is just that there is some actual ink from a pen on the paper ANYWHERE: e.g. the large multinational pharma company I worked for had to get all the directors to sign-off on various government stipulations: the IT infrastructure could send the documents anywhere in the world instantaneously, but the US government still required some ink as proof, regardless of what the actual signature looked like (in comparison to what they expected).
That was before the electronic signature was accepted, though. Now, it is possible to use a registered asynchronous digital cipher to confirm that an individual authoured a block of text, as well as to confirm that the text hasn't been altered, AND that only a person with the decipher key can read it.