Right now, the TSLAs with FSD will disable it in snow+rain, so I assume that even if TSLA achieves L4, it will be only under ideal conditions until they have enough data to resolve these edge cases.
What about that instant before it figures out it's bad enough weather to shut itself off? What is the threshold?
On the other hand, there are a lot of videos of FSD Beta on youtube that show the car driving into the sun where it's almost impossible for a human to see, but the cameras detect all of it.