I guess it still makes sense for higher abstraction levels though, right? Like a filesystem or other shared access to a storage resource. So these asynchronous APIs aren’t writing as directly to storage, they’re placing something in the queue and notifying when that batch is committed.

> Append-only log structures are what NVMe/flash devices live for.

I would think this is also good for filesystems like ZFS, APFS, and BTRFS, yes? I had an inkling but never really looked into it. Aren’t these filesystems somewhat similar to append-only logs of changes, which serialize operations as a single writer?