What's the alternative to LIDAR that is working?
Good enough for humans is one thing, but the promise of self-driving automobiles is that they're supposed to be able to be better than us and safer. Incorporating all the sensor data available shouldn't be looked down upon.
Also humans rely on hearing and tactile response data as well as vision when driving.
Source: driving fail videos and personal experience. I am really scared to drive slowly and safely during snowstorm, there is very real risk to be reared by some idiot flying twice the speed I drive.