It's so easy to caricature... Almost everybody agrees that the height is fine. We all see outside, some trees 3 or 4 floors high. The proof is that screens posted by Tbag are fine for all despite trees are tall too.
But look at the differences :
The difference is not the height but the complexity. Everybody knows that some trees are 20m high but they do not look like little shrubs with tripled volume and do not have leafs with the size of an Opel Blitz...
By the way, the trees in the second screen are really good looking.
I think people are focusing on the scenery because that's what we see the first on screens and also because most of us know that Oleg and his team will provide us an amazing sim on every other sides...
The few problems IL2 had where related to sceney like "flashy green" and scale problems.
Personnaly, I focus my attention on trees and land textures because everything else is almost perfect to me. It should be taken as a compliment... If the most demanding simmers are complaining about trees, it means that Oleg is on the right way, isn't it ?