Yes, as you said, I imagine an ideal situation where a phrase can be marked as a keyword, and then there’re some convenient ways to show the mentions in the base (vault) and even navigating by them. Up to a point, [[link]] can do that but it’s mandatory to create a note, a .md file named with the keyword; and the #tag cannot tag a natural phrase with space.
It seems possible. such as attaching a mechanism to [[link]] to open a backlinks pane without creating a note file, or extending the #tag syntax to support the expression like #‘Natural Phrases’…