Mine is Strawberry since it has a ton of options and plays a ton of formats. It's also (distant) fork of Amarok 1.4 and integrates well with KDE Plasma. I'm curious what other people are using these days. What's your favorite player?
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Because unlike your file manager both Darktable and any decent music player can work with file metadata in addition to the actual files.
And why do they do it? Because most people like to use it that way - instead of painstakingly making sure your files are in the correct folders (and then being fucked when you want to play anything that's not sorted like that - say, you have everything by artist and album, but now you want to play everything by a specific genre; or in image editing you want to filter by how you rated that picture so you know which one to pick for an edit).
Not everyone needs that, sure. But most people appreciate it - especially if the software does it well.
You can do all of that with most basic file explorers. I use Dolphin on KDE. Change the view to "details" and right click the top and choose which metadata fields you want to show up. Then you can sort or filter using metadata.