The problem some people simply do not get is that the manufacturer or producer receives orders from the distributors and importers and then divide their manufactured stock between those. Those then divide their share between the orders they received from the retailers. Those are the only ones who fulfill the orders "first in, first out".
So even if you preordered the very day preorders opened up, you will not receive a copy if your retailer only has copies for those who ordered the same day, but before you did. And they only know that when the distributor tells them the quantity they'll receive, which they cannot if the manufacturer did not tell them.