In my opinion, the human factor of the driver in racing is quite important. It wouldn't be so unpredictable, it would be just a team of engineers putting together something that could fail for technical reasons, but that probably would behave always in the same way. Race drivers hate or love each other, are funny or serious, follow the instructions or their guts, I think that is also part of the beauty. They suffer physically and emotionally, they have to stay focus and work hard to achieve that.
I love how the technique and different techniques are evolving and it'd be great to have an autonomous car for commuting, but racing is something else. It's interesting to see how different companies develop different solutions for the same thing though.