The impression of "wrong" arises because you look in close up at chunks of generic created landscapes. This can hardly be avoided - after all it's a flight sim.
The problem with trees and other vegetation is, simply said, that they are very hard to be done right in 3D. It's an insane amount of work to do a good looking tree (from afar, but even more so from up close) in 3D, and it becomes very quickly polygon hell. Unacceptable polygon numbers for a game that has to render things in real time. Hence the popularity of optimized libraries like Speedtree or other tree generators. There are lots around for just that purpose. I am quite frankly rather impressed by those trees - they look really convincing for a tree that is obviously heavily simplified in polygon complexity. It should be no problem to put other species onto the map. The question is just how many Oleg is willing to buy for diversity purposes. (and maybe they are already there, you just don't see them on the selected screenshots).
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