Yeah everyone is different. Most western women I know just find being housewives and stay at home mums incredibly boring.
Our main reason for day care though is so from an early age our daughter is learning Japanese and making Japanese friends. Being a full blooded round eye she is always going to stand out in this country but if she grows up with other young Japanese kids and speaks the language fluently hopefully she won't be treated too differently. She seems to love it at least.