Since only ~0.1% of Drupal sites are still using Drupal 5 and it's not supported since 2011, the questions and answers are outdated and probably not useful to anybody.
Can all Drupal 5 be closed as outdated? Closed/locked as outdated for historical purposes. I don't think any new answers will provide any new benefits.
Most of them doesn't provide any benefits, because nobody uses Drupal 5, so the information is outdated and can only confuse people. The benefits include that it can prevent some spams.