Unlike ordering a Tesla (mostly are queued). For example a Camry hybrid (or whatever) if you just signed for the car without buying any additional products. Doesn’t matter if you “signed” in April of this year. If another buyer willing to purchase a premium protection package, winter tires and rust protection crap by the dealer. That buyer will get the car a lot sooner than you would. At the end of the day, the dealer are looking after their profit margin.
Flip side is like going to ER if you have a cold you are going to wait 20hours before getting seen compared a stroke or heart attack. In this case priority is given to urgency.
For dealer priority is given to profit margin.