That’s not necessarily true. What you get is two separate things inputting raw data into a system that both need to be parsed. Sometimes, one won’t agree with the other and can cause issues with how the car thinks it should respond.

Nobody has a fully working system at this point, so it’s premature to make claims about what hardware is and isn’t needed. It may very well be that LIDAR is a requirement, but until somebody figures it out, we’re all just speculating.