If you are referring to the fact that DH is the main breadwinner, I still do a little work each month that brings in a nice bit of money and almost all of that is getting banked which has added up over the years, I could return to work F/T if I wanted, so risking having no income isn't an issue.
I don't know why God chose men to lead, he just did. It was a never question of capability for me, I'm more than capable, DH and I have a similar level of intelligence and are qualified to similar levels. I just see my role as different to DH's and this comes from having faith and I chose to follow my faith. For clarity, I mean lead in a family, women who go to success in the business, sport, academia etc. should be celebrated however this isn't my path in life.
To clarify a point, DH doesn't carry the entire burden on his shoulders, I do help him, advise him, support him etc. I even give him business advice, it's really no different to how the majority of relationships work, where you discuss things together, the difference for me is that DH has the power to make a final decision which overrules mine. The truth is, he actually rarely overrules me.
This all comes from faith, faith in the Lord and faith in my husband. Every time I've questioned a teaching of the Church, I've discovered there's always been a very good reason why it teaches what it does. The Church has had 2000 years of the world's greatest theologians pour over every word in the Bible. I've got to the point where I now have total faith in what the Church teaches. Sometimes this can be difficult at times however I understand that I have to accept this. Likewise, I have to accept DH's decision, others even those with same faith as me would disagree with this.
"Wives should be subject to their husbands as to the Lord, since, as Christ is head of the Church and saves the whole body, so is a husband the head of his wife and as the Church is subject to Christ, so should wives be to their husbands, in everything." Ephesians, 5:22-24