Really it’s little different than many modern drivers being dependent on the GPS for long trips.
Once you map all the roads and account for very imaginable situation and scenario --- the unexpected and unanticipated will still occur.
Mapping isn’t about unexpected situations beyond the loss of GPS.
"Just like people do" is only true if you see 7 year olds driving around, I imagine they would have similar capacity to make decisions on the road as Tesla FSD does. Except I imagine even a 7 year old wouldn't just let go of the wheel completely.
The use case of self driving taxi already exist as in you tell an app where you want to go and an empty car with AI driver shows up. The app doesn’t always summon an AI driver, but when humans and machines are doing the same job don’t expect the humans to win indefinitely.
Neither of these is capable of being placed into a random environment and actually "driving" from environmental feedback with minimal directions (turn left, go right, stop) --- which most any human driver can easily do.