I also feel that will continue to be the case in MY 2020 ; so a now built 2020 may have some differences compared to a 2020 built in the summer. There is a chance this benefits resale if the car improves in the next 9+ months, even if you don't have the improvement the resale market may credit you for having it.
One last comment, is in some states (like mine in MA) ; Excise taxes are due yearly and depend on the model year of your car.
For getting at this time of year a 2020 instead of a 2019 I would pay more in taxes next year and every year moving forward, those differences would likely offset any gains I would see on the resale market if/when I sell the car.