TUCKnTRUCK
That guy
Did you read what I posted above from the other website? This sounds like a one off thing. They could have continued as is but the unforecast wind made it so IF they had to descend they wouldn't have had enough. We're talking a few hours at 10,000 ft....that was the issue. If the weather was accurate in the flight plan then if wouldn't have been an issue but like @TUCKnTRUCK said they run the flight plans hours in advance.
The sad part - the inflight information available to most modern GA airplanes far exceeds what 121 guys get. 172's get better stuff than a lot of corp. jets get... And the lowly iPad on wifi far outpaces even that.