depends on the local soil. he's north of Houston so probably has more bayou soil, whereas I'm in an area that has a lot of rock underneath only a couple feet down. if I had to guess, all the builders have bought into the myth that it's too expensive to dig a basement and tell you it can't be done. and yet on some steep hillsides, especially those that have scenic views or on waterfront, I do see them dig into the sides of the hill for at least the slab walls.
personally, unless the potential of flooding made it problematic, I would put a basement in just for the house cooling factor alone. and if you are in a tornado zone, put a safe room in too