I bought this set (6-84719 Santa Fe Super Chief LionChief Set w/Bluetooth and the 6-84724 Add-On Baggage Car) in December of 2018. The observation car is part of the set.
I have since purchased the 6-84725 Add-On Vista Dome Car.
Yes, a non-powered A unit would be a must buy.
The baggage car not being illuminated is a disappointment to me also.
***ETA*** Here is a photo of the set without the Vista Dome car.