Honestly ..Its because all your considering in that post are the legal remifications. Which as I pointed out can be very easily solved.
When it comes to commitment and the symbol of said commitment, Legalities are irrelevent. Think of it from Vi's point of vew. HMA asked her to be his wife. Commitment number one. When they get married that commitment is replaced by the commitment they make in those vows. INSPITE of the LEGAL commitment they make an emotional commitment to each other. When you chose to have children with someone its a emotional and physical commitment for life. The big picture.
I donít get many things right the first time
In fact, I am told that a lot
Now I know all the wrong turns, the stumbles and falls
Brought me here...
And where was I before the day
That I first saw your lovely face?
Now I see it everyday
And I know that I am
I am, I am
~ Ben Folds five ~