The point is that signatures are supposed to be a frequently re-used piece of text that identifies yourself you in a way you want to presented. Just a thing to help you save time on "Best regards, Tomas The Cat" thing. And if you have to include a URL of yoru sit e- fine - those interested will see it and will be able to look it up. A link, however, has a lot more issues in it.

And another benefit - signatures populate to all posts - something you can't do with

Signature:
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