I would argue that a volume manager is just one of many parts of a good file system. Managing physical devices at the file system level has advantages: the file system can balance its data automatically in the background. Linux LVM can't do that.
I think this gets into the more philosophical part of the debate like with systemd, where it seems like it could be argued that the separation is better—or not—depending on your needs.
And for my own needs, I typically favor the security of not throwing too much complexity on top of my storage system (if it would be impossible for me to recover something without relying on a ton of magic I can't fully understand, I'd rather not use it in production).
