Dealers AND auto makers don't like that because some people will place an order and then the next day cancel it. If the dealer instead puts them in a car that is "close enough" most people will keep the car even though it isn't perfect. They do lose customers like you who are very specific about what they want, but they gain more. (or so they think)
The pandemic made it so they'd actually take my business, we negotiated the purchase contract at the time of order, and I got it without all of the stuff I didnt want.. like nitrogen air, tint, and the 'paint protection' BS. I did have two minor quality issues - the rear AC vent trim bit was not fully seated, I fixed that myself, the other one is the gas door sticks on, why? no idea - the dealer has tried a couple things, I've found cycling the opener 2-3 times opens it just fine.
What I wanted was in a color not commonly stocked, with an unusual interior color, and the upgraded engine, with all the packages - but without a sunroof. That's a nearly impossible combo to find, my car is like 1 of 22.
I think you need some cars on the lot for people who can't wait 3-6 weeks for a vehicle, but I think you'd see more customers move to ordering, if it was an option.