Asynchronous Shipping Company Configuration Confusion

I’m trying to understand the Asynchronous Shipping Flag.

Based on the Field help

I thought it meant that if you were auto invoicing, In customer shipment entry would allow you to just select your next pack and ship it, that does not seem to be the case you still have to wait until if finishes its processing and the shipment is marked as invoiced. Seems to be similar behaviour in Kinetic UI as Classic.

I’m wondering if I just don’t have enough lines entered to make it have any effect (at least in Kinetic) or is this for shipping/invoicing partial orders.

If anyone uses this flag I would be interested to find out more…