Changing CMS from WP to Drupal, will it effect rankings?

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CMSs are a big part of how websites are ranked. Changing from WordPress to Drupal may have an effect on the ranking of the website. Drupal is known to be more difficult to use than WordPress, so it is possible that the website will rank lower because users may not be able to use it as easily. Additionally, Google may see the switch from WordPress to Drupal as a sign of instability and rank the website lower as a result.