This thread might suit your needs better:
Autonomous Car Progress
@diplomat33 will help you with your arguments.
There is a fine difference I am not sure if I made it clear. I really am not so familiar with Lidar, only know that it has draw backs, such as it cannot penetrate fog, and will treat plastic bag as solid material.
But can anybody say that they know 100% of FSD in Tesla and that Lidar will add absolute no value to it down the road?
My point is not so much about whether Lidar is good or bad. My point is if Tesla decide to add Lidar later on, then it is a show of strength, not so much of an engineering failure.
AFAIK, lidar can have some difficulty in rain and fog depending on the density of the rain/fog and the wavelength of the lidar.
But lidar has some big advantages over cameras, making it a really good sensor to have for both driver assist and full autonomy:
"“Lidar technology is inherently superior to camera and radar in certain performance aspects that are crucial for avoiding forward collisions and which support a move within the industry to implementing lidar as a crucial sensor for ADAS applications.”"
"Lidar performs free-space detection more efficiently and precisely than cameras, by providing real-time measurements of how far surrounding objects are from the vehicle, with no additional computational processes or sensors required. As a result, data from a single lidar sensor directly provides the fundamental building block of a successful driver assistance system: accurate free-space detection. That is, lidar utilizes precise distance measurements of surrounding objects to map areas where it is safe for the vehicle to drive.
In contrast with lidar, camera-centric approaches require multiple sensors and complex computational processes to infer distance of surrounding objects and thereby determine safe driving paths."
Revolutionizing driver-assistance systems with forward-looking lidar, part II
This is why many automakers are now including a forward facing solid state lidar located in the front bumper. They are cheap, are hidden in the front bumper and add reliability in detecting hazards or objects in front of the car.
Ultimately, all sensors will have pros and cons. There is no single sensor that works perfectly all the time, in all conditions. This is why on page 47, the "Safety for Automated Driving" document recommends using multiple sensor types:
"As of today, a single sensor is not capable of simultaneously providing reliable and precise detection, classifications, measurements, and robustness to adverse conditions. Therefore, a multimodal approach is required to cover the detectability of relevant entities. In more detail, a combination of the following technologies shall provide suitable coverage for the given specific product:
CAMERA - Sensor with the highest extractable information content as sensor captures visible cues similar to human perception. Main sensor for object/feature type classification. Limited precision in range determination, high sensitivity to weather conditions.
LIDAR - High-precision measurement of structured and unstructured elements. Medium sensitivity to environment conditions.
RADAR - High-precision detection and measurement of moving objects with appropriate reflectivity in radar operation range, high robustness against weather conditions.
ULTRASONIC - Well-established near-field sensor capable of detecting closest distances to reflecting entities.
MICROPHONES - Public traffic uses acoustic signals to prevent crashes and regulate traffic, e.g. on railway intersections. Thus, devices capturing acoustic signals are required for automation levels where the systems need to react to these."
So, I agree that if Tesla added lidar in the future, it would not be a sign of failure. It would simply mean that they recognized advantages in lidar to compliment their existing sensor suite.