A minor nuisance. Unless you happen to be at the ready attentively double-checking whatever the assistance is doing - then it must be infuriatingly annoying! Guess what you're supposed to be doing, all the time...
For example, motorcyclists depend on inferring behaviour more than the average driver. Someone swerving towards an exit is far more reliable an indicator of them taking it than a signal - many drivers don't bother using them.
Many bikers I know avoid Teslas like the plague, as they're deeply difficult to read at best, and lethal at worst.
It is critical to be aware of the surrounding traffic, and recognizing the driving style — the wheel angle and the current balance/attitude of the cars — is critical to understanding what they'll do next.
Just one example a while ago in traffic on a highway, I slowed a bit and moved to the other side of my lane, barely thinking about it. Seconds later the car on my left suddenly drifted into my lane, right where we would have been and only feet off my front bumper. My wife exclaimed "How did you know that was going to happen?!?", and I said I'd just noticed in the corner of my vision an odd wiggle in their front wheel, like the driver's attention or direction was off.
Sussing out what a driver is doing with any intersection, regardless of their signals, is key. Are they actually setting up to turn or stop, or just going along ignorantly?
So far, I haven't yet noticed anything big from Teslas, but although I've done a lot less driving since COVID, I still have noticed that their road positions and attitudes are, ummm unique. But really good to know about this fake-move towards the exit lane — very helpful — Thanks!
Any traffic participant (of any type) behaving sufficiently differently than the fat part of the bell curve for the situation (traffic, weather, location, vehicle type, time of day, etc) they are in is dangerous because they violate the expectations of all other road participants have for them. Other road participants need to be able to make reliable enough and accurate enough predictions of future state for things to work properly. This holds regardless of human or computer.
And honestly it's less inference and more "I assume this person is going to try to kill me. How would they do so and how do I avoid that?"
I haven't ridden in years, but even in my car I'm allergic to being in someone's blind spot.
It wasn't a great first user experience to have the car immediately drift right towards the guardrail crusher.
It's entirely possible that is an unsafe-at-any-speed configuration.