Curious if anyone familiar with Drupal’s AJAX implementation (at least how it was in v5-7, I haven’t used Drupal v8 onwards) back in the day and has used this c

Curious if anyone familiar with Drupal’s AJAX implementation (at least how it was in v5-7, I haven’t used Drupal v8 onwards) back in the day and has used this can offer a comparison? A sense a lot of familiarity