Now obviously this has been wished for hundreds of times I am sure, fix the Trees and shrubs so 60 ton tanks don't get flipped over by shrubs... so I am curious, why hasn't the trees or shrubs been updated/fixed? 

While Im no expert, imagine the coad that would be needed to make an object destroyable by running into it (buildings which are destroyable with explosives but NOT by running into them) Then add that to EVERY tree (because you can't pick and choose which trees you can run into or not). Can you imagine the size of the game then? Map makers would have to place each tree never mind placing a tile and move on.
So it's a game concession. I look at it as obsticals that you should avoid, much like sign posts, telephone post, dogs, people and such when I drive on the road in my car. With the GV from the commanders position it is even easier to drive and gun on the run than it use to be.