As per https://github.com/theforeman/foreman/pull/1105/files#r9750682, we found that the web UI could be potentially confusing when comparing resource lists (e.g. domain index) and the new host form.

The resource lists show resources both up and down the tree from your current taxonomy, while the new host form will only show resources up from the taxonomy selected on the form. This disjoint could prove confusing for a user who can see resources in leaf taxonomies, but is creating a host in a middle or parent taxonomy.

Some ideas that we had when discussing implementations were:

1. filters that allow the user to select "upwards" or "downwards" views
2. allow multiple current taxonomies, so users can select an entire tree of current taxonomies
3. encourage users to stay in "any context" and rely on search techniques more
4. add the taxonomies for each resource to the list