Interesting, I did not know that!
In retrospect, if I knew this, I would have gladly coughed up the $3000 to add it. But I clearly remember when I bought the car the $3000 AutoPilot description did NOT include “summon” (this is the feature I am dying to get due to my small garage space). Summon was part of the FSD package IIRC.
Honestly, Tesla keeps changing things around, it is hard to keep track.
Prior to ~Feb 2019 your options on the 3 were:
EAP- 5k (more after purchase)- which gave you
everything new FSD cars currently get (other than the HW3 upgrade)
FSD- 3k (more after purchase)- which gave you....0 features so far but you'll get the HW3 upgrade, plus any new still-to-come features.
After that you briefly had a choice of:
AP- (2k at purchase 3k after I think?) that gave you nothing but TACC and autosteer in a single lane
FSD- 6k (now 7k) that gives you everything else EAP used to have (Nav on AP, summon regular and advanced, auto park, auto lane change, etc) plus the HW3 upgrade and all future features.
Then soon after they raised the price of all the cars (but the base SR) by 2k, and made basic AP "free"
Anyway, bottom line, the 2018 car is about the same price (net of tax credit) as an actual apples to apples car is today.
There's not been the "massive" price cut folks keep thinking there has been.
For that you need to talk to some Model S P100D folks.