I agree with the threadstarter.
BIS has worked on the grass in the beta patchs, but the AI still has the detection advantage (whether the player has already been discovered or not).
If you put the player on the southern side of a grassy hill, put an AI on the northern side of the hill, then walk up the hill slooowly,
the AI soldier will see your head through the grass (and headshot you ) before you can see anything on the other side. (terrain was set to normal for the test)
It seems that the view blocks are not the same size as the grass.
I play with GDT Mod Grass so that the fight is more fair...