There's no reason to believe in just cameras. Cameras are easily blinded by glare and have their efficacy drop dramatically when they get dirty. Having inexpensive lidar AND cameras is the best of both worlds. When it comes to safety and comfort, we shouldn't be trying to optimize for cost. If we figure out how to make cameras alone bulletproof in the future, great. But there's not where we're at today.

I think that supports most people’s viewpoint though. Visible light Cameras alone can ‘work’ but more sensors is of course better. You infrared example for instance.

The only reason not to have more sensors of different types is cost (equipment and processing costs). Those costs are coming down fast.

Same limitations as radar and ultrasonic and ladar and vision cameras combined?

Even Tesla used to have radar and ultrasonic in their cars until relatively recently. And they use lidar (from Luminar) in their mapping fleet.