I understand it can be frustrating when things are updated before you even get your new car, and having the "old version" is (almost) never a good thing when you want to sell. And always having the latest and greatest with Tesla means you are gonna change cars very often...
I got a great deal on an inventory car just before the end of the year. Bought on the 28th, took delivery on the 31st... I'm glad I didn't have to wait 3+ months to take delivery, would have been painful second guessing my choices for months while new features were introduced. If anyone is worried about taking a huge hit on value once they take delivery, I would recommend checking out inventory cars at the end of a quarter.