I started my web development career with Joomla, around 2008. At that time it seemed somewhat convoluted -- having arbitrary levels of hierarchy to define a basic content model and redundant concepts for extending core functionality (i.e. what WordPress calls plugins and Drupal calls modules). Has Joomla managed to simplify it's architecture in the past 12-or-so years?

Also, open-source CMSs are lacking for non-proprietary drag-and-drop layout builders (such as can be seen in Wix). Does Joomla have core or a fully open-source extension for drag-and-drop page building?