Force native taxonomy-term pages to only show  and not all content Natural state ends with an ocean of duplicated content; at least in some cases, this could be an SEO disaster.

How do I force native taxonomy-term pages to show only the H1's and not all content (all nodes) associated with the specific term?

When I searched the UI I couldn't find a way to do so. Maybe it is possible with a module.  

Note: I can use views for that, but my aim is to change the naturally-created taxonomy term pages without Views.
You can override the default listing with the built-in view, see here https://drupal.stackexchange.com/a/165052/3218

To only show the title you then need to adapt the view:


go to the view's edit page (admin/structure/views/view/taxonomy_term/edit)
change the format-display from rendered entity, to fields
remove all fields and add the title field as only field