Take-off in zero zero is quite easy with blind flying training, even more with a catapult. The tricky thing is the landing, when you have to find the airport or even worse, the carrier, even if you are guided by radar or radio waves. If you ever should get the opportunity to drive in a car with 100 mph in a fog with 100 meters visibility or less, on an unknown road, you will know what I mean
Even today with much better standards and instruments you need special equipped planes and special trained pilots with hundreds of hours flying experience to land in a visibility of 200 meters or less.