[wrs]

I’m sure you’re aware of the issues, and this looks like highly useful work! But I’ve seen enough human nature to know that a lot of people will see “POSIX API” and assume they can just run anything on it without further thought. I know this because for years I’ve seen people run things on AFS and NFS, see weird concurrency behavior or data loss or latency, and blame the filesystem for not performing miracles, rather than blaming the application for not taking nonlocal storage into account.

The strongest argument for using a different API for object storage is that you don’t get that excuse. The API presents the true semantics and failure conditions and the application needs to think them through. (And your position that it may not be a strong enough argument is perfectly valid.)