Most constructors aren't consistently good (i.e. publishing more than one puzzle a year) and so the crowdsourcing model makes sense. And the editors do rewrite

Most constructors aren't consistently good (i.e. publishing more than one puzzle a year) and so the crowdsourcing model makes sense. And the editors do rewrite many of the questions and provide feedback which is important. Crosswords can already be generated by AI, but writing the clues in a clever way is non-trivial, making the fill exciting is not a solved problem, and most importantly a shallow AI cannot conceive or generate a theme. AI crosswords will become a thing around the same time AI-created novels do.