ZFS and other advanced versioned/copy-on-write filesystems are really cool and useful but it's not a source code management tool. E.g. the examples show branch

ZFS and other advanced versioned/copy-on-write filesystems are really cool and useful but it's not a source code management tool. E.g. the examples show branching but not merging. On the other hand, this might be useful for storing binary large files that are not really diffable and mergeable, and thus a bad fit for Git. However, the typical use case for this is art assets in games, which means that it's the artists and designers who are the target audience. Git is often said to be too difficult for non-programmers, and ZFS or BTRFS is definitely not easier.