It's better than having no locals at all.
I don't know where you got it's better than no locals at all, the #1 reason viewers watch TWC is for a Real Local Forecast (not for rushed and fake powerpoint Squeezebar) and especially not seeing a Local Forecast at either the :28 or :58 is a complete waste of utter time just to put up to 5 minutes of commercials in its place
Especially those viewers in the affected areas of Irene may have wanted to see the Tides and Marine Forecast (who don't have internet) or the Radar/Satellite (who don't have Weatherscan) in which that fake L-Bar doesn't even have.