Do you really think men have less complicated lives or fewer obligations?
Traditionally, yes. The man went to work and then came home and was waited upon. Raising children and taking care of household responsibilities was the woman's job. It was enough for a man to just bring home a paycheck. Conversely, there really weren't many roles for men. Fewer choices to make.

I think the norms for that are changing, but not as quick or as widespread as we might like/think.