add more inaccurate sensors and do corrections in software? We have photos of black holes out of almost a pure noise, surely it is possible to build self driving car with current gen of hardware.
The point here is that Tesla have already sold the $10k FSD sensor pack to people and told them that one day in the future a software update will provide FSD, with no additional sensors necessary. Adding more sensors is not an option (well, maybe Tesla will do that for people who bought the upgrade, but it seems unlikely they'd do that for free.)