A bit of speculation here: TWC removed the "weather.com" text from the LDLs because of burn-in concerns on certain displays. The "weather.com" text was one of the few static parts of the LDL (aside from the TWC logo which they'll never remove). Now that weather.com is removed from the LDL, TWC can feel a bit safer about leaving the LDL up for the entire duration of long-from programming without damaging viewer's TVs.