Picture This ..
Apple .. why did you make the 42mm SS Link Bracelet your poster picture boy when you didn't have any for delivery on 4/24 to begin with ?
The Pre-Orders went so wrong specially with this "bit expensive, yet affordable" price range if I may say so ..
You begin with spending more than the cheaper version (Sports Watch) which were ordered the most and less than the ones which would be bought the least (Edition Watch), however you get less precedence over the cheaper ones. I'm pretty sure they must have got an idea with some statistics around Favorited items in our Apple Store App. Probably the should have run a survey way before making adjustments to their orders to the suppliers. You should know like a car company what sells the most & the least - Hatchback, Sedan, SUV, Truck and then go to assembly line.
We pick up these in blind faith, with try on appointments starting the day of pre-orders. So like everyone, I was buying a $999 watch, burning the midnight oil without even looking at it before ordering. Fine this happens with iPhones as well, but it's a matured product. So Try-On should have been a week before Pre-Order if I may say.
Now, I don't buy that Apple won't have been aware that this particular model (42mm SS LB) won't be shipped on 4/24. If you knew that some of your models had limited availability or no availability. Then allow users to order in the morning instead of waking pre-order night and rushing to know when ordered that "Oh No.. I'm not getting it on 4/24".
I see no one claim that they are getting some of the uber expensive Apple Watch on 4/24 itself. It more seems like a Apple Watch Sports launch for 4/24. (if you wanna see it this way)