I’m not exactly sure how it used to be sold and marketed, but the impression I was under based on what Tesla said (not Elon nor other people)
Below is a copy from the order web page (dated 3/20/2018) when I configured my 2018 MS as a lease. Here are the EAP and FSD options available and associated wording:
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Enhanced Autopilot
Enhanced Autopilot adds new capabilities to the Tesla Autopilot driving experience. The enhancements include going from one to four cameras for greater accuracy, redundancy, and to see fast-approaching vehicles in adjacent lanes. In addition, 12 ultrasonic sonar sensors provide 360 degree coverage around your car with almost twice the range and resolution of the prior version.
The significantly increased sensor information is processed by a computer that is over 40 times more powerful than before. Your Tesla will match speed to traffic conditions, keep within a lane, automatically change lanes without requiring driver input, transition from one freeway to another, exit the freeway when your destination is near, self-park when near a parking spot and be summoned to and from your garage. That said, Enhanced Autopilot should still be considered a driver's assistance feature with the driver responsible for remaining in control of the car at all times.
Tesla’s Enhanced Autopilot software has begun rolling out and features will continue to be introduced as validation is completed, subject to regulatory approval.
$82 /mo.
$6,000 upgrade after delivery
Full Self-Driving Capability
This doubles the number of active cameras from four to eight, enabling full self-driving in almost all circumstances, at what we believe will be a probability of safety at least twice as good as the average human driver. The system is designed to be able to conduct short and long distance trips with no action required by the person in the driver’s seat. For Superchargers that have automatic charge connection enabled, you will not even need to plug in your vehicle.
All you will need to do is get in and tell your car where to go. If you don’t say anything, the car will look at your calendar and take you there as the assumed destination or just home if nothing is on the calendar. Your Tesla will figure out the optimal route, navigate urban streets (even without lane markings), manage complex intersections with traffic lights, stop signs and roundabouts, and handle densely packed freeways with cars moving at high speed. When you arrive at your destination, simply step out at the entrance and your car will enter park seek mode, automatically search for a spot and park itself. A tap on your phone summons it back to you.
Please note that Self-Driving functionality is dependent upon extensive software validation and regulatory approval, which may vary widely by jurisdiction. It is not possible to know exactly when each element of the functionality described above will be available, as this is highly dependent on local regulatory approval. Please note also that using a self-driving Tesla for car sharing and ride hailing for friends and family is fine, but doing so for revenue purposes will only be permissible on the Tesla Network, details of which will be released next year.
$49 /mo.
$4,000 after delivery Requires Enhanced Autopilot
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What stands out to me is the highlighted sentence that basically implies that software had already been written. It just needed extensive testing and approval. That is very misleading in my opinion. We are now more than 4 years later, and it still cant do everything listed above, and what it can do it does poorly.