I did not know this and explains why I see so many teslas with their blinkers on and not maneuvering despite having ample room and time. Ultimately this behavior makes them unsafe for their occupants as well as others around them.

Cars only work because we can predict driver behavior, if they break that prediction that’s when bad things are likely to happen…

Lately I’ve started to ignore Tesla blinker.

Most probably because it has a radar that the Tesla lacks. That means your car has two sources of truth and can very efficiently and quickly make an informed decision about whether or not there's anything in the way.

Kia Telluride here but I assume it's the same underlying system as Hyundai - I can attest that it's very good (and doesn't cost anything extra like Tesla charges lol) which makes sense considering they have the majority stake in Boston Dynamics since a few years ago.

I bought an IONIQ 6 with Hyundai Driver assist II, and it's not what the reviews cut it out to be.

On stretches of pretty straight highway and in traffic, it fares very well, only requiring minor interaction, but on larger curves, it completely disengages with no tone or warning, just a light on the dashboard that turns off.

I'm fully aware you're supposed to drive a car by paying attention to the road, but if the whole point of this feature is to make driving more chill, randomly disengaging makes me distrustful of it

Tesla FSD will change lanes when you use the blinker. It will also accelerate and remain engaged if you press the pedal, e.g. if you want to coax it forward at an intersection.