Cars are used to transport people from A to B. So why build complex and expensive software and hardware to drive the car when a complex and expensive piece of human hardware gets in the car anyway? Where is the benefit?
I believe that the answer is simple: a significant percentage of drivers derive no pleasure from driving, it is a chore they would like to pass to someone, or something, else.
Even for those of us that like to drive there are times when it isn't fun....the morning drive up the M3 to LHR, the M6 at any time, I could go on.
Would I buy an autonomous car? Not yet.
But I will not say "never".