Robots could make a short stop or go slower to process an unclear picture, that is probably not the problem - but the image processing itself, is still way too unreliable. Under ideal condition it mostly works, but have some light fog in the picture or strong sunlight and ... usually all fails.
Otherwise the Teslas would have indeed full self driving mode, using only cameras.
>Robots could make a short stop or go slower to process an unclear picture
The costs of doing so are hugely dependent application. It is not, for example, an attractive strategy for an image-guided missile, though it's probably fine for an autonomous vacuum cleaner.
Otherwise the Teslas would have indeed full self driving mode, using only cameras.