Regarding the auto headlights being on, I did notice on mine (a 2019), that if I start my drive from a dark place (e.g. parking structure) and drive into daylight, that it sometimes doesn't turn the headlights off for a LONG time (15 minutes to an hour or more). This doesn't happen when I just leave my garage, however. I actually need to drive a short distance in the dark first.
But I'm 100% with you, auto headlights is a simple feature, it really should work better. On the plus side, my headlights have always turned ON when they should. It bothered me at first, but when I realized it rarely happened overall, I stopped caring about it.
Regarding supercharging. Obviously do whatever you're comfortable with when it comes to leaving a buffer, especially across large expanses like Texas. However, what others have said is completely true, you get MASSIVELY faster charging at lower states of charge, so if charging speed does become important to you at some point, keep that in mind. For example, 20 minutes can get you roughly from 10% to 70%, whereas it also takes 20 minutes to get from 70% to 90% (approximately).
Regarding horn honk on lock. Mine is good and loud. Does your horn work correctly? All it does is "tap/toot" the horn, maybe your horn isn't healthy.
Regarding your AP stuff not working. Don't know about that. Haven't had this problem. I've been in very stormy weather where the cameras couldn't see the road well enough and the car warned me that some features wouldn't work, but it always cleared up within a few seconds or minutes when the visibility was better. As far as lane departure not working right.... I can tell you that every time I've tried to DEMONSTRATE this feature, either to myself or to my passengers, it doesn't work. However, every time I've taken my eyes off the road for a second and didn't see the road curve slightly, I get the screech and wheel tug, and before I'm in any danger. Its like it knows the difference somehow between you accidentally doing it, or doing it on purpose. It does, after all, have a camera pointed at you (despite what they say it can/can't do). Anyway, that's my experience.