Wider lense tend to distort more, especially if you are off plumb. For interiors and some landscapes that may not matter, as you may want that look, but for people shots you definitely would not want the persons on the two sides to look different. I believe that the problem starts around 24mm, which may be why 24mm and 28mm were so popular for press reporters. Below that FL if you are slightly off the plumb you get fantastic effects, but not linearity. What you get with FX is better linearity with lower cost for the same FOV.
As the FX is 36mm wide and the DX 24mm wide you get 50% more coverage width wise with the same FL. That is why I think that the FX sensor is better suited for wide angle shots.