it says that Orocommerce supports Marketplace features (like multi-vendor setup), but the features page (where the marketplace page links to) does not mention any such features! Also, no such features are to be found in the demo, or in the documentation, as far as I can see.
So it seems like we are missing something important here.
It would be a shame to reject the framework for lacking these features, if they exist somewhere.
P.S. I also found a commercial plugin which claims to add most features required for a B2B marketplace. But I still would prefer to find out if and which such features are supported natively by the framework.