Cameras arent deemed safe enough even in optimal conditions. At night and in rain without cleaning?
This isn't factual. The current Tesla system has advanced, with only cameras, to perform about the same in adverse conditions as without.
There's no current evidence that night or adverse conditions are an absolute limiting factor in development. Currently it's software and potentially camera placement, but that's a poor argument that because no one has done it yet, that it can never happen. By that standard no one will ever reach level 5.