There is a separate feature request for this: Vault Health Reports in all Apps
There is a separate feature request that would provide such functionality: Pinned (and collapsible) search queries to customize Vault view
It is documented in the Help Center: Search your Vault | Bitwarden
I don’t think it is poor UX to offer advanced features for power users, especially of those features are documented. Even Google offers a large number of advanced search operators, which are not even documented by Google (much less visibly shown on the Google search page).