I think personality makes a huge difference in whether or not people want to be close to the rest of the family or in their own private space.
Also whether or not you work outside the home, whether paid or volunteer work comes into play as well. I work with the public all day 5 days a week. My other job I only work with one or two people. By the time I get home I am ready for my own space. I do keep my one day a week I have off for my family and we eat dinner together each night at the dining room table.
Having said that I do have a basement sewing room (with one NW window) it is not quite 10x11, and not nearly big enough. The ironing board is in the adjacent family room. There is fabric stacked in totes behind the sofa there too.
I could easily use twice the space.