How do we feel about features we paid for being given to cars that didn't buy that option for free? I ordered the tech package because of navigation - so if they basically upgrade cars from the past that didn't pay for it, I will have mixed feelings about it. Happy for you, but feeling a bit ripped off.
I try not to play that mental game, especially in the world of gadgets and/or hi-tech... of which the Model S is closer to than car in terms of functionality/development/support.
Stuff that used to be extra is often included in the next update/model for free... be it computers, operating systems, phones, and now cars.
The tech package was worth it for me at the time, and remains such. I've already received more functionality and warranty coverage than I originally purchased. I'm a happy camper... and I'm happy for other folks who also got another perk.
If I purchased today I also would get auto-pilot HW, newer seats, etc... my buddy has all of those on his, and we paid about the same price... but such is life. I've had the pleasure of driving this car for longer than the vast majority of current owners.... that's worth something in itself.