Why even offer alleged rsync support for Cloud Archive when it's broken?

I don’t get it. I spent over an hour setting up on your empty promise about rsync support for Cloud Archive, and all I get is a broken mess. Everything gets re-uploaded, even if --update is set. Transfer just flat out fails for certain files without explanation and for no apparent reason. And all I find about it are ancient posts on here that never got replies. Why even offer that feature, then?