[klmr]

Why? Because all typical, existing applications written for POSIX systems use the POSIX API (usually indirectly) to interact with the filesystem and perform IO. Being able to use that vast ecosystem of existing applications seamlessly with object storage is such a common requirement that a good dozen different object storage-to-POSIX abstraction layers exist (many of them on top of FUSE).

Even if you build your scalable production environment from scratch with native object storage support (which is rare!), it’s eminently useful to be able to use coreutils to interact with said object storage for devops: nothing beats e.g. running grep on a list of log “files” in an S3 bucket in terms of convenience.