Allocation is the daily decision. When less is landed than was ordered, somebody chooses who gets short, and doing that by whoever telephones first punishes exactly the regular customers a supplier depends on.
Every batch carries its history. Where it was harvested, when, under which registration and who received it has to be reconstructible, and an inspection or a health scare gives no time to assemble it afterwards.
A quote is only true for a few days. Prices follow landings, so a figure sent without a validity date becomes an argument the moment the market moves.
The delivery has a real deadline. Live product that arrives after service is worth nothing, so route planning here is not efficiency, it is whether the sale exists at all.