NEED FOR SPACE

Something that's being so often used by almost everyone but what I don't get is:

When you see organizations pushing individuals to the limit making them overcome things they could probably do with some balance to their work life, the same individuals wouldn't fight for their SPACE. They give it another term saying it's their ambitious nature that drives them.

The same individuals you put them into the personal space, say it a relationship or family they will not drive themselves to do the same bit in such circumstances. I'm quite sure there are enough things to do and handle at home but does one drive themselves to do their bit for the HOME??

or other individuals who are more part of their life??

I doubt it in most cases.

So what is the determining factor between the professional life and personal life of an individual,

Why isn't there the same "NEED FOR SPACE" in both aspects of LIFE??