That said you do have a good point on their return policy.
Test drives are a different beast altogether though. At least when I got my Tesla 4 years ago it wasn't common to test drive the same exact configuration you were ordering anyway since everything is custom built.
I guess for both of these items if they were to come up I'd hope Tesla would be generous, but I still see nothing wrong with them removing features people didn't pay for.
I've seen this happen with apps and SaaS services and I find it so annoying that I actively try to downgrade immediately where possible. Sadly this isn't always possible. Evaluation is subjective, and pain points are often only obvious once you run into them (i.e. passengers complain about cold seats).
>it wasn't common to test drive the same exact configuration you were ordering anyway since everything is custom built.
You're right that's common practice, not just for cars.
... and you can't downgrade anyway, because you're on a "old" plan that can't be changed to anything.