A good product would be if I could exchange Bytes and Blackbytes(!) directly with uro, USD... within the Byteball app.
If those are your wishes, Blackbytes are not for you. Fiat-conversions undo any privacy you have with Blackbytes.
You can't seriously expect the Byteball wallet to have an exchange ready with all banks on earth.
A good product would be it if I and numerous other merchants on Open Bazaar could exchange my goods for Blackbytes.
Have you contacted Open Bazaar for this? They're the ones who can implement this.