" May you live as long as you wish, and love as long as you live"
cite me that law in most states that is simply not true.
the piece of paper is a very common one if you go to a law firm you would in most cases not need to even see a lawyer unless they were hustling you and trying to make you pay for time. The piece is very similar to the "power of attorney" paperwork so would take less time and less paperwork then a marriage license.
Yes it does matter because if there is no advantage a disadvantage or simply a marginal advantage then you have to take into account the Cons as well.
when you say legal framework you are arguing the tax side of things, most polygamists are more about the religious aspect of the marriage then they are about the taxes they would be happy if they could simply have a religious ceremony to signify there marriage without being put in jail.
1) If Gay marriage were legalized then if a church were to deny a marriage because it was against there beliefs then they would lose there "nonprofit" business license.
2) In a military sense if you allowed gays to marry people would all be married to be allowed off post housing and BAH along with many other things which then needs to be changed and it couldn't be just changed for gays it would restructure the entire format of BaH and make it less accessible to the military as a whole.