actually, sakura, i think that a close emotional bond is crucial to emotional development, but not that it has to be with the birth mother. as mothers we are conditioned (by society, and our own bodies flood us with hormones) to believe this. yet, there are too many examples of children raised by fathers, or adopted parents, to make this true.
i think we want to feel that we are so necessary, and then at the same time made to feel guilty whether we stay home (you're not working, you're at home) or go to work (abandoning our children)
i think that the sahm, with wohd set-up lends itself far too easily to an imbalance of power. either the sahm runs everything, including her dp's life, which often leads to her resenting the responsibility, and him being infantalised, or he is the one 'doing the work' and she gets treated like the infant.
it should be possible for each adult to be respected for performing a worthwhile, contributory role within the family, whether that is based at home or not, paid or not, but that just doesn't seem to happen.
this come back to the big discussion on cognitive dissonance. i genuinely believe that as adults we wish to be respected and thanked for the roles we play, and that most of us wish to share this with an equal partner who we hold in esteem. if two adults are working together like that, then we are happy. if the balance has shifted, then not just one, but both partners feel the ill effects of this, and start to suffer. in more pronounced cases, this can lead to depression of either, or both, partners.