Having worked for Volvo Cars I know 90% of the cars on the line are ordered cars. Only 10% will go into stock or showrooms.
Only the welding and paint factory work with batches and stockpiles.
A client orders a car specify’s he’s/her wishes. The colour and model will be taken out of stock and be planned onto the assembly line.
So this would be a nice feature to add in my oppinion.