Shoulder bag is something I would love to. It seems to be very practical. Second battery, or third battery isn't mandatory but good to have one more.
If you buy Anafi and the second battery separately it would cost less then extended but you can't buy those bag. It seems to be more practical, more convenient to use than other aftermarket bags or backpacks. Especially when you are outside, walk and going to fly Anafi.
You open the bag, take Anafi, take controller and you are good to go.
If I bought now, I would buy the Extended version.