I think everyone is too used to Amazon one-day delivery.....
And CEMechanic gave us a realistic summary of the many problems that can arise.
As mentioned before, software (possibly related to regulatory requirements) may be a problem. In the good old days, we did not worry about that, but now, getting the software right is probably the most difficult part.
But, as I am in the US, I am happy that they are holding back on our deliveries, as they should manage to have things sorrted by then (hopefully!).
They still say vehicles will be in the hands of some early adopters before year end......