So people killed 7 of the 10 trees in Lubbock?
Around here, if you let a pasture go, it will become a forrest. If I accidentally kill one of the several thousand hackberry trees on my place, I don't give a crap. Plus, I too have been spraying what I please in 100° weather for years. The only time I have killed a tree was when I meant to, and that was with Remedy and diesel.
So, I still disagree with your broad brush statement. How many geographical, and ecological regions are there in Texas?