Hierarchical file systems lack expressiveness and are awkward in places.
Hierarchical file systems made the most sense back in the days of the spatial desktop metaphor [0] pre-OS X classic Mac OS Finder. The ability to organize your files in a spatial manner and have the system preserve the one-to-one relationship between a file and its (virtual) physical location within the system was what made it work.
As soon as the browser metaphor (or navigational) file manager [1] took over (owing much of its success to the web browser), this relationship was lost and the system became unwieldy.
Hierarchical file systems made the most sense back in the days of the spatial desktop metaphor [0] pre-OS X classic Mac OS Finder. The ability to organize your files in a spatial manner and have the system preserve the one-to-one relationship between a file and its (virtual) physical location within the system was what made it work.
As soon as the browser metaphor (or navigational) file manager [1] took over (owing much of its success to the web browser), this relationship was lost and the system became unwieldy.
[0] https://arstechnica.com/apple/2003/04/finder/3/
[1] https://en.wikipedia.org/wiki/File_manager#Navigational_file...