If you land at B1 and have a connecting flight at D1, you know you are having a bad day.

From a practical standpoint, I don't find the low B gates super terrible, my DFW//SWO flights used them quite a bit before the E nest took the E140/145 flights. I usually would just walk there from wherever because after considering the walk to the Skylink and then from the B skylink, you might as well just hike direct from most gates, using the southend A to B and/or north end C to D people-movers across the highway which are decently fast**. But the south-end the D terminal doesn't have any connections so you really do have to take the Skylink from wherever and then still do a hike.

(**They should put some people movers along that B to D stretch though)