No, they are the worst.

Guillemets require using space around them («wrong», « correct ») which makes typesetting so hard as you have to hunt for each guillemet that fell to the next line to manually fix it.

And even that's not possible on the web, so you have to get used to dangling punctuation.

They don’t require a space around them. That’s a French thing. They don’t require that in Swiss German.

Also not in Norwegian and probably others.

In LaTeX it’s quite easy to change the kerning so that one needn’t leave a space in the plaintext. It’s akin to e.g. east Asian full-width Unicode punctuation marks, or even slightly dated English typography (when there was a little more space before most semi-colons).

Could you use non-breaking space instead?

Use non breaking spaces between the content and the guillemet...

You should use U+202F NARROW NO-BREAK SPACE for French punctuation spacing.

That's also required with every punctuation symbol with two parts in French so : ; ! and ? also require an extra space.

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