[mikejb]

Whilst Lidar and cameras may have similar wavelengths, they have very different information outputs. Cameras give you a 2D colored image from which you essentially guesstimate the distance of objects. Lidar gives you a 2D depth map with much higher confidence in the data that comes out of the stream.

Elon has a high incentive to talk down Lidar in cars: He/Tesla placed the bet initially on cameras because Lidar is/was too expensive, and promised these cars will be able to drive themselves ("regulatory approval pending"). Retrofitting Lidar is not an option (price, sensor&cable placement), so a lot of his (and Tesla's) promises ride on cameras working out and Lidar not being necessary. A lot of Tesla's (Car's and Car company's) value rely on cameras working out and Lidar not being necessary.

[Seanambers]

From what I understand Teslas have a front facing radar giving them accurate range measurement forward and they incorporate that in and use nets to do SLAM for other angels where the radar isn't.

But i'm not an expert in this so take it with a grain of salt please :)