The discussion is all around why their traditional vote deserted them, especially when they will bear the brunt of further austerity, cuts, gig economy etc.
You are so right on this. I remember going to a hustings in 1992, with Michael Foot speaking, and he went on and on and on about Labour's landslide victory in 1992. I was with a Labour voting friend, and I turned to her and remarked that my children would be old enough to vote in the next election and they really didn't want to hear about what happened in 1945, any more than I, casting my first vote in 1970, wanted to hear about great things which happened in 1925.
Labour then did get a massive landslide in 1997, but it wasn't by going over old 1945 ground - it was a fresh appeal to a new electorate.