Why would you assume people didn't have fun?
I find it odd that people, you among others, choose create this narrative that classic edition games are just dirt farmers and drudgery and death.
Actually, I'm not sure now if things have really changed that much. I've had fun playing Basic D&D back when I was 10 and I have fun playing Basic D&D now.
I think an interesting poll for those who promote this narrative of older editions would be what age did you play older editions and when was the last time you played them.
My theory is that people who may be close to my age may have played them as children or teens and had bad experiences (because they were children and teens) and then never played again. They then carry that experience into their adult lives where they then moved on to modern rulesets as adults. They compare their current experiences with modern games as they are, now, to their previous experiences with classic games as they were, then.
At least in my own experiences, I had fun playing back when I was 10, but I also had experience with the drama and immaturity associated with that age.
After burning out from modern D&D (4e to be specific) I revisited the classic games. I looked at them as an adult, objectively and without bias of past experiences, and saw something so compelling that it has completely revitalized my rpg gaming life. I also now play those games quite frequently, with adults, and I don't see any of the bizarre narratives that tend to be espoused here.