If the need to work is not related to financial gain; is there really a good enough reason as to why I should go out and work and leave the parenting to someone else?

For some women, being a mother is amazing but it's not enough. Maybe she wants a sense of independence, freedom and a sense of self -- and for some, having a job helps with attaining that. I asked my mom who was and is still a full time working mother my whole life and she said she did it because she did not want to entirely depend on my dad financially. She married young and she never had the chance to do certain things because my grandpa was so strict. So by working, she got the much needed freedom and sense of independence she never had. In fact, my father encouraged her to go for career and she did. Me and my siblings grew up just fine under the care of my late grandma and later, by being latch key kids. Our relationship with my parents was and is still great.