We're driving a Tesla Model 3 refresh 2024, and it has the speed nag at every start up. It also has a lot of wrong speeds for portions of roads around our place.
Sometimes it's temporary speed limits that were set during road construction and then never went away, sometimes it doesn't understand that you left a type of road and went onto another one with a different default speed limit, it's pretty infuriating.
And that's a car that has cameras all around, onboard image analysis software and permanent internet connection. I can't imagine how that'd even work in cars with less capabilities.
Hilarious anecdote about this website: the owner once said there are tons of entries in the usage log of people misunderstanding the purpose of the website and inputting celebrities names to try to email them. :D
Our first Model 3 from 2019 was leased with FSD, which was definitely underwhelming enough to barely ever turn it on. We drove from southern Germany to Venice Italy without even thinking of using it once.
When the leasing contract came to an end, we got the refreshed model 3 from 2024, this time without any driving assistant, just the plain normal car. And I haven't missed any of it, just the park assistant was nice because now I can't park it on the side of the small European streets first try, but I'll learn eventually.
It was a horrible deal back then for 5000€, now it's more expensive and hasn't gotten any better.