Files and folders are a necessary evil for working on metadata, but that's all. I certainly don't use them to browse my music collection. I use Windows Explorer to browse folders.
It seems to me that there are plenty of other things missing in Groove that should be fixed first.
For example, "Cast to" networked audio devices via DLNA. It's been over a year since a Microsoft spokesperson said:
Eventually the new music app should have support for casting to such devices, the video preview app should already have this support enabled.
...and we are still waiting.
It's a sad sign of the times that the venerable Windows Media Player still has more functionality and capability than Groove.
Personally, I've given up on Groove. I use Roon. It's not free, in fact it's probably expensive in most people's eyes, but it does a far better job than Groove is ever likely to do of handling my music collection (supporting, amongst other things, albums, artists, composers, genres, year released,
works and performances) and streaming to multi-room audiophile-level systems.