I can confirm, the lightning is overdone. Partially I do it myself, of course… When I go to the Wold Map and click on the edge of a region with clouds, you get nice clouds… you get a front with real bad weather but the lightning and thunder should only be sometimes in certain places, not everywhere along the front, all the time. In the Netherlands we have a website called buienradar.nl (rain radar) and you get red and black spots where heavy rain and lightning occurs. Maybe MS/Asobo should import extra weather data from these rain sites…
I got this too on final into KDFW during a thunderstorm. I heard the crash and my whole screen went completely white. I thought I had a CTD but with a white screen. But a few seconds later all came back up. I was also in the FBW A320. I realized that my plane had probably been struck by lightning. I actually criticize this game quite a bit. But this was really cool. If that actually was a lightning strike simulation it was a good job at doing it.
Indeed, when there is clouds you get lighting. With life weather I always get some lightning, when there are clouds. With using weather settings, I did not notice it with clear skies, high level clouds, few clouds, or scattered clouds. It will set some probability of lighting when you choose cloud cover. You can set that chance back to zero.
It could also have something to do with these multi-layered clouds ? You fly mainly 10-40 kfeet I guess ? always above the first layer ? You see lighting between the cloud layers ?
I don’t typically use presets, so I can only speak for live weather. I know yesterday I was flying from Key West to Miami. At KEYW, there was literally a couple of tiny clouds over the airport, and the skies looked like a scene out of a Roland Emmerich film.