It originated with MongoDB as their primary storage and interchange format, so I'd assume it at least was meant to be optimized for that purpose.
Either way, like I said, JSONB and BSON are solving slightly different problems—you probably would not choose BSON if you don't need the extra data types, and if you do need the extra data types JSONB can't help you any more than JSON can.
Comments
It originated with MongoDB as their primary storage and interchange format, so I'd assume it at least was meant to be optimized for that purpose.
Either way, like I said, JSONB and BSON are solving slightly different problems—you probably would not choose BSON if you don't need the extra data types, and if you do need the extra data types JSONB can't help you any more than JSON can.