Where has Column browser in "Music" gone? Why is the Dupe process so occluded?

Once upon a time, iTunes (R.I.P.) had a very nice feature that allowed a top file "browser" which allowed you to browse sogs, artist,and album indifvidually. Such a nice feature. Easiest way to find dupe songs because you could select individual artist or Albums and see the titles in iTunes. That's gone. Speaking of dupes, why was the duplicate finding feature so gutted. In 10.14, you select Library/Show Duplicate Items and you get a nice banner at the top of iTunes (R.I.P.) which allowed you to display dupes from the same album or just in general. Gone. Gone. Gone. Who's brilliant idea was it to make you once again select File/Library/Show all Items to return to a display of all items rather than just clicking a Dupes button? More and more functionality seems to be disappearing in a quest to make macOS like Windoze.