Yes, Nokia is not the retailer and is separated from the retailer by several pints in the logistics chain. Without imposing artificial delays, they cannot state a date when all retailers will be ready to ship to customers.

Why are people moaning about delay when Nokia are actually doing more than any other manufacturer to minimise delay?

What is possible to state with reasonable accuracy between a single retailer and a single customer does not scale up between an initial supplier and millions of end customers.

How many times do I have to repeat myself?