That would be an interesting dive. I can say recently (as in the past few decades) I think it's just from inspiring content or people conflating certain facts along the way.

Kinda like Malcolm Gladwell's 10,000 hours thing. That study did happen, but the study points out particular points that Gladwell just skipped over when he popularized that in his book.

Beyond that, I think a lot of it has to do with culture. In America and in Canada, benefits are tied to our work and so it instills this idea that work is our identity. It's only natural in our minds that we transition from more work forms a stronger identity rather than spending time sitting at the table and speaking to our partner, kids, or other human beings.