I'm not sure that Hewlett was expected to be, nor that she was, a natural slave. Reading the article, I get the distinct impression that while she had to make some tough decisions, she made those decisions and things worked out quite well. The important point here is that, as she noted, she had options:
... But in my early 40s I hit a second wall. The pressures of my ever-expanding job were crowding out my small children. I was becoming an over-committed wife and mother. How could I help my five-year-old deal with separation anxiety when I needed to catch the 6:30 a.m. shuttle to Washington two out of his first three days in kindergarten? Something had to go. I tried to negotiate some flexibility, but my board was convinced that running an organization required a five-day-a-week, in-the-office commitment.
Reluctantly, I quit my job. I tried to focus on the positives. I did, after all, have options. I had a hugely supportive husband who earned a good living. I could build on the success of my last book and write from home — a work schedule much more compatible with the needs of small children. Still, I felt regret. I resigned the week of my 41st birthday, and as I moved out of my corner office I knew that this was the end of my on track "male" career. Even if I managed to become a successful writer, I would never again be seen as an up-and-comer. But I knew what I had to do. I went home, regrouped, and started a new career as an author and activist. I worked long but odd hours, traveled only rarely, and saw a great deal of my kids.
Men are not so much allowed to be 24/7 company men as they are required to be. It sounds to me like the problems that Hewlett ran into was that same requirement. She had to be a 24/7 company person. Why do we accept that requirement from corporations as a valid requirement? Why do we allow corporations to determine how we will live? It is not a valid requirement in terms of the productivity achieved, nor is it compatible with living the way most people want to live.
The real problem is that we, as a society, allow corporations to require that their employees be 24/7 company drones.