Hi all,
Just wanted to let y'all know that Brooke Heaton and I have just released Drupal 8 version of the popular_tags module. It is very helpful to sites that want to encourage editors to converge upon a smaller set of frequently used tags, rather than a huge set of infrequently used tags.
This module allows the users to select taxonomy terms/tags by just clicking on them rather than typing them (auto-complete) or selecting them from a select box/checkbox/radio etc. It shows them a list of tags, sorted by popularity (defined as how many nodes are tagged with it), up to a configurable maximum number. Also, when you hover over a listed tag, it shows how many times it has been used.
See more at https://www.drupal.org/project/popular_tags