People dont' use Finder? "File system power users"? Are we talking about MacOS or iOS here? Seriously, I think that's an interesting take - that does not relate even a little bit to most work domains I ever was in contact with.
Spotlight has replaced app search.
In-app file browsers have replaced a lot of Finder functionality (project views, file views, browsing etc. in IDEs and power tools).
And given how anemic Finder still is, I wonder if its use among power users is very low.