If AP needs AHB to activate then why doesn't it need it 10 seconds later when it apparently lets you turn it back off?
If it doesn't need it 10 seconds later with AP on- why did it need it to turn it on?
Easy: it "prefers" it. That's different from it "needs" it to function. I'll use an analogy. On my camera, when I pop up the flash on my camera (or I leave it popped), it turn on auto flash. I can turn it off manually again in the menu or push down the flash to disable. I can take pictures either way, it's just with the flash on it's easier to get a better exposure on the subjects, especially in low light. However, I can still take a decent picture even without flash on.
.... no?
This isn't a "single thing defaults to on when the car turns on"
This is "You must have thing 1 turned on before you are allowed to turn on thing 2"
This is not a default setting, it's a dependency
It's not a default for the car overall, but I'm saying it's a default for AP. Basically the car defaults are what the car overall "prefers". The AP defaults are what AP "prefers".
I'm not sure of other examples, but off the top of my head, I'm thinking about start-stop hybrids. They all default to turn on start-stop mode when the car turns on, but it allows the user to turn it off for the rest of the trip. That's only possible because the car does not
require or depend on start-stop mode to be on to be able to function properly. Rather it's something the manufacturer
prefers you use to meet regulatory requirements and reduce idle emissions.
But it DOES require you to have it on to activate AP.
Hence why the current behavior does not make sense.
if it needs it, then it needs it, and being able to turn it off while AP remains on is a bug.
If it doesn't need it, then it shouldn't REQUIRE it to be turned on before you can turn AP on, and THAT is a bug.
Again, you seem to be looking at things as black and white and not seeing there is something in between. Even if looking only at 3 states, there are at least these three:
Required: Activating AP turns on AHB, does not allow you to turn it off at all when AP is on.
Preferred: Activating AP turns on AHB, allows you to turn it off when AP is on.
No Preference: Activating AP does not change AHB state, AHB state is completely independent of AP.
It's only a bug if Tesla didn't intend you to be able to turn it off. If Tesla made this change on purpose (it seems they did), it's a feature, not a bug. If it's a bug, I imagine in future updates it won't let you turn off AHB in AP.