When browsing assets in Tridion Sites using the Media Manager integration, it would be useful to be able to search and/or filter using Media Manager's tags.
An example: if images in MM are tagged "contains people" or "no people", then a content editor using Tridion Sites could search/filter using those tags.
Searching by tags in this way is a different UX than navigating through MM's folder structure, which is the current UX. I'd argue that they are both valid ways to navigate and pick assets.