The only downside is dusting off the ID3 spec, amending it, and then somehow coercing everyone who thought music tagging was “done” to update their software to support it.
The software part of the solution is easy-peasy. The political part, infinitely harder.
It’s a problem of communications as much as it is vendor support. If you get the consumers wanting it, vendors will switch to it. Instead, right now we get companies like Apple reinventing the wheel via their own proprietary FS just to adopt some features of ZFS, rather than _just supporting and contributing to ZFS_.
Which means I get to anxiously eye the Synology with btrfs instead of resting easy with ZFS. It’s better than ext4, but I also know I’m the exception rather than the rule.