That's a buttload of work to have done. I'm surprised it hasn't been modified already, but there are so many glitches in FS that are REALLY bad (check the chasm-and-spire near SYKM) that fixing the minor stuff is sometimes a bit low on the list.
But you are correct. That shot you put up is depressing. I'm disappointed in MS, that they would deign to not even improve the scenery there, since it was that bad in FS2000! But, as I have seen recently, MS has left a lot out in this version of FS. In fact, there is absolutely no trace of the Great Wall of China anywhere in the FS world!

Talk about lack of trying!
But if you want to make a sort of quick fix, you could add your own "billowing clouds" by downloading the
Special Effects SDK and reading up on it. It actually isn't that hard, and the effects are already included. Just making an XML setup is all that is needed.
Good luck!