I didnt read the whole thread , it always seems to be some kind of CONSPRIRACY
The actual Reason is the substrate, the clay that most of OK rest on.
Yea theres parts that dont have ..as much, but its still there.
?The clay swells and contracts with the water tables, thus making it move a great deal.
The Conspricy is that no engineer will admit to it, that means They cant solve the problem
TIFWIW/WTFDIK.... -_ /
So soil types change at borders. Good to know.