I agree with you that the public use case makes more sense than the private one, though really I feel that it's not about "public" or "private" but rather about

I agree with you that the public use case makes more sense than the private one, though really I feel that it's not about "public" or "private" but rather about different sides in some market, whether it is public or private. But I'm not sure I understand, were any of those use cases "private?" When I mentioned "manage property, contracts, microtransactions, data commerce, file storage, or certification, to name a few things", I think pretty much all of those besides file storage (on which I'd defer to Blockstack) represent agreements or exchanges between different sides in a market or platform.