I don't think so. The heros journey does not need to be about "rugged individualism" at all. Not is about it all across cultures and history.
We like stories about rugged individualism. We prefer them. And oftentimes, we change original stories fro. other culture to fit the patterns we like or ignore those that don't fit them.
And also, across cultures and history, the hero journey is far from the only or even primary kind of story.
I dont thi k thats true at all -
Lets see, oldest stories - buddhism, hiduism - none of them are about individualism.
I wouldn't say the christian writing or that of ancient Egypt is about individualism either.
The oldest 'hero's journey' I can think of, would be myths of ancient greece - but ewually, many of them are not heroic, they are dramas.
The dominance of this genre is a compeltely modern phenomena
First the taboo against consanguineous marriages was most likely because of genetic diseases. Biology may not have been very advanced, but people were smart enough to pick up on patterns. Similar to taboos against cannibalism despite having no concept of prion disease.
If this was pushed by the catholic church then explain Italian families!
Is “the hero’s journey” not a story about rugged individualism that has been told over and over in different forms across cultures since the beginning of history?