Cloud Visibility

You're right. I don't customize my weather also. I use real-world weather, and in this case, I get surprised sometimes by sudden high-low visibility changes when descending.In fact, I don't even use the "real world weather" because of the realism factor. I just don't like to spend my time using creativity to set up weather. If there was a button called "Surprise-me!" instead of "real world weather" I would use it too, as long as it didn't make it snow in Brazil, hehehe...I wonder if REX or ASE weather engines correct this issue.

I don't know how well, or not, REX or ASE deal with this, but I have to say for the 30 seconds or so it takes to set up a weather theme that correctly deals with low level visibility, I find it's worth it. In fact, there's nothing to stop anyone from setting up a few of their own weather themes and saving them as flights with a description of the weather.Personally (and certainly for anyone flying in Europe) the most important realism factor in the weather is visibility and I'd say every single time I use real world weather in FSX, it give totally wrong visibility.