Our lawn needs this treatment because here in Missouri, the weather extremes (100°F and dry in the heat of summer, 0°F and 6" of snow in winter) tend to kill many common grass varieties like bluegrass. Much of the grass in our yard has croaked after long dry periods in the past few summers, and what remains in those areas is a tough layer of thatchmostly dead grass and rootsthat prevents new grass from growing.
So the plan is to essentially till up the most of the topsoil and thatch, plant a blend of native fescue grasses that's not quite so pretty but is better suited for this climate, and grow a new lawn.
I think if I lived in Oklahoma, I could plant bermuda grass and everything would just work.
But perhaps that climate presents its own challenges? I dunno. What do you all have to do to keep a lawn looking reasonably presentable where you live? Any tricks or tips, or regional uniqueness to what you do? Is your philosophy to do the least possible work to avoid nasty looks from the neighbors, or do you enjoy taking care of your lawn? Discuss.