With LIDAR you would at least know that there's missing data, and the system could react accordingly (eg. sound an alert or stop when the road is no longer detected)
The problem with camera based systems is that they don't know that they are missing data, and the system just thinks the path is clear...
Why shouldn't a camera based system be able to do that. Dirt for example won't easily match up in a stereo vision system and even then dirt on a lense has a pretty specific look
