I'm not sure it was always "damage." I fell in love with the 154-minute cut of IT'S A MAD, MAD, MAD, MAD WORLD when it first came to my neighborhood theater in 1965 and when it played on TV and in revival theaters over the next couple of decades. None of the "restored" versions come anywhere...
Once upon a time, roadshow versions of films were routinely cut after their roadshow release and were shown in neighborhood theaters in shorter versions, as was the case with BEN-HUR and IT'S A MAD, MAD, MAD, MAD WORLD, to name two famous cases. I think the same was true of another western...
We always knew this was going to be about a motley crew of passengers isolated in a snowed-in cabin along a stage line. That was pretty clear from the descriptions of the film ever since the story broke about the script being leaked some years ago. There's a whole history of westerns like that...