Page manager (or panels) override path I want to override Drupal 8 paths (routes) like node/{node} or taxonomy/term/{taxonomy_term} with custom panels variants. Is it possible?
Page Manager module.  Add a new page that has the Path of /taxonomy/term/% and as @Todd Young wrote, disable the default Taxonomy view.

However, there is a bug that this is not working at https://www.drupal.org/node/2785195