I would not want to try to deal with the number of distinct classes it would take to express that same level of information. I'm not sure it's realistically possible.
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I'd say there's still a place. Type info only goes so far and PHPDoc is more than just type information!
I work with Drupal on occasion and deal with PHPDoc-driven documentation like api.drupal.org/api/drupal/core%21l...
I would not want to try to deal with the number of distinct classes it would take to express that same level of information. I'm not sure it's realistically possible.