What worries me is that FSD in Tesla does seems to sometimes introduce problems in the driving behavior with new updates. I have not experienced this first hand ( don't own one ) but I am following the r/TeslaFSD and it looks like new versions are sometimes regressing on situations that were handled correctly on older versions.
This leads me to believe that FSD is not yet solved to the level we thought and training to handle a certain new thing correcty can degrade handling of other situations
I'm curious what is in your rubric to determine that a self driving car that doesn't need supervision is a worse driver than a car that does, by your own admission, need supervision.
99% of my FSD disengagements are navigation related: leaving it too late to merge into an exit lane (or CA drivers speeding up to not let me merge), not being aggressive enough at going into the opposing lane to overtake a stationary truck (though, it's a lot better at this in recent versions).
I can only recall one "oh shit" moment on an older FSD version when it carrier too much speed down a steep hill in SF and went through a 4-way stop and I had to slam the brakes. A lot of the strangeness / hesitance of previous FSD version is gone in the latest updates.
I don't expect self driving to be 100% perfect. I feel like FSD today is a 90th percentile human driver with super human reaction speed + visibility. Holding a "never gets into an accident" it too high of a bar. FSD consistently drives better than me (with the caveat of navigation: I know the city, I know which unprotected left turns are easy vs. hard, I know which routes tend to be faster due to local conditions, etc).
FSD is excellent in how reactive it is to thing you don't even see: e.g. car on the 101 at slightly drifts into my lane, I didn't notice it, FSD reacted. I feel WAY more unsafe now riding in an Uber vs. hands off FSD'ing in a Tesla.
Only had a handful of Waymo experiences but a lot more with Tesla. Tesla may be leading but is still not great. Driven over 100k miles in autopilot and roughly 30k in FSD miles, you still need manual intervention about 5-10 percent of the time for various reasons.
Waymo has a lead. Tesla's lead is about the same as a Roomba's.
Seriously though, if you're considering an EV, please give the traditional US/EU/JP/KR automakers a chance. Don't try to help the planet in one way while staking its heart in another.