[xiaolingxiao]

From public information it's a matter of price and "appearance." No one who's half serious about understanding how the system work would use cameras alone, but remember of all the companies who's serious about putting self driving cars on the road, Tesla is the only one who designs, manufactures and sells cars. Incidentally, Tesla is also the only car company pushing camera only as a "solution" which again, it is not. All other outfits are tech pure plays, so their incentive is more geared towards a working system, because that's the only thing they can sell aside from the dream. If Tesla fails with a camera-only self driving car system, they can still sell cars. Source: used to work in robotics, all my classmates from grad school work or have worked at a self driving car company.

[kzrdude]

It sounds very stupid from their side to be stubborn, at least, that just means they have an existential risk to the whole company, if they don't get their fav solution to work.