"Being a SAHM is not being financially dependent on your husband, it just means that one of you is doing the childcare"
well... in many cases the stay at home person DOES end up being financially dependent on their partner. It can cause problems, specially if either of the two gets resentful or if the working person is some kind of tyrant or if they are abusive or if the couple hasn't properly discussed how things will operate.
Plus, does being a SAHP mean you do ALL the childcare? I think that's a bit wrong.
If you asked me I would say I would rather be rich enough to not work and stay at home with my son than survive on one poor wage. However, I know that all the riches in the world wouldn't prepare me or the tedious day in day out childcare that i would end up doing and the resentment I would feel towards my husband for having a life outside of the home.