What is wrong with expressing how one would prefer a product to operate under particular conditions? Just because it operates a particular way now, doesn't mean that I accept it and am fine with it being that way forever.
I dont think "Its pretty clear that Tesla wants us to drive around the city on AP so they can gather data on it's performance" is expressing any such thing.
However, there is nothing at all wrong with expressing preferences or desires, we all do it in these forums. But if you read your posts they are not describing
behaviors ("the car did X under condition Y") but
failures ("the car did X under condition Y which was not good"). You can only classify something as a failure if you have certain justified expectations of how the car is
anticipated to behave, and the observed behavior deviates from these expectations.
So, if you are using TACC/AP in a way specified in the manual, then yes, you
can have the expectation that it will behave as described, and deviations from that
can be considered failures (such as getting stuck in the left lane, which AP currently has trouble with).
But when you use TACC/AP outside of its specified use, then how can you have any expectations at all? Where do they come from? They certainly don't come from Tesla; they come from
you. But that's just a subjective expectation that you have conjured out of thin air. I might want my Tesla to fly me to the moon, but there is no point in my posting that AP is a failure because I am stuck on this planet. And though it might sound silly, your expectations for TACC/AP during city driving are exactly the same.
So it's fine to say "I've been experimenting with TACC/AP on city streets and have found X", and you can even add "I think this would not be good for the car to do when Tesla upgrade TACC/AP for city driving." This is all useful and informative.
But you cannot then go on to say "TACC/AP is useless/dangerous/xxx on city streets" because that implies it
should have done something different, and that "different" can only be something you have conjured out of nothing.
Stated succinctly: Dont expect a machine to do something it wasn't designed to do.