Well said. I do think there's still a strong element of self-centeredness to the behavior. For example, my ex played video games for 12 hours a day sometimes while he watched me raise our four children. His job was fixing medical equipment in area hospitals, but he only had to go in if he couldn't walk them through the repair over the phone. He was fantastic at his job, so he was home. A LOT.
He was home making my job harder, not helping at all. It seems to me that any reasonable person would realize the position they found themself in more or less required them to help with whatever needed helping. Even if he did man jobs like fix the cars and mow the grass. Which he did not do.
And this dude had military experience. It's amazing to me when I consider the fact that he did literally nothing to contribute except hold a job. And was of course confused when I left him. "Didn't see that coming".
And my story isn't unique. So it stands to reason that this isn't a new development. It may have gone on for generations that men simply feel entitled to women's free labor and they will push her to do everything until she breaks. Obviously not all men - I also had a partner who did literally everything around the house, but I think he's the exception.
Obviously that's just one example, but the idea of man spreading seems to be not just physical, but a part of their very personality. Women try to make themselves smaller to be accommodating, men seem to spread. I can't be in a relationship because I can barely hear myself think for all their noise. If that makes sense.
It just really feels like they have a sense of personal importance that tramples over their partner's autonomy.