Should Wikipedia and other wiki user signatures be required to be unadorned default?

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Wikipedia (and other similar wikis) allows users to customize their signatures, including changes of font face and color, background color and choice of any text in the signature including non-alphanumerical Unicode code points, including smileys. Should that be allowed? Or should it rather be mandatory to use the default signature?

Wikipedia and other wiki user signatures should be required to be unadorned default

Arguments for

• Argument for Too many users tend to create unseemly looking signatures. They choose garish colors, fonts, put bizarre labels on the links to their talk page, etc. This could be addressed by creating restricting guidelines, but the language of beauty is hard to make objective and prohibiting signature customization entirely is the one policy that is very easy to administer.
  • Objection Other policies are very easy to administer, e.g. disallowed are changes in font face, font color, and background color.
    • Objection That has to be administered/enforced, whereas customization of user signatures can probably be disabled technically.
• Argument for The freely customizable signatures enable something like an arms race for whose signature is going to stand out more, resulting in some truly bad signatures.

Arguments against

• Argument against Users should be allowed some room for self-expression. While it is true that some user signatures are very bad, this can be addressed by a guideline.
  •  Comment As argument for stated, the guidelines can be hard to formulate in a clear objective language.
  • Objection Review of various polls and votes shows that most users do fine with default signature, without this form of self-expression.
  • Objection Users have their user page for self-expression. Their user page is not copied to so many places, unlike their signature.