I got the opposite impression. Bottom line, there's two interfaces:
The interafce is as you described. All functionality is handled outside of MAS90 using BOI. Limited scanning - only order number. Does not require Starship Link. Can map additonal fields and UDfs.
The other interface integrates just as V9 did, through Shipping Data Entry. This provides the functionality of packing using the barcode scanner, etc. However, at this point they don't have anyone to take over development of the Starship Link beyond 4.4.
So, unless you need scanning, I would recommend the Starship interface.