YABU.
Your argument fails abysmally, as it rests entirely on the premise of, 'this is the way things have always been done, ergo any other way is wrong and weird'.
And also, just for good measure, your argument fails also, as it rests on the premise that all men are Just The Same. 'Straight-forward' was one objective used.
For goodness sake...! 
Women - you can't keep your own name after marriage, because it's too confusing with all members of a nuclear family having different names, plus whose name do you give the children - Mum's or Dad's?
It's really best that all people with mental health issues are put into asylums and given lobotomies and/or electric shock treatment because anything else means they are a danger to society.
Slavery is the most economically viable means of harnessing a workforce in many agricultural societies.
It is best that new babies spend a minimum of two hours a day at the bottom of their garden in a pram, getting plenty of fresh air and an absolute minimum amount of human interaction - it helps them become independent and be less clingy.
Women shouldn't enter politics as they are too emotional and don't have the required logical, objective brains.
Be wary of employing Mexicans - they are work-shy procrastinators.
Seriously - this is the level of your debating. 
Times change. Relationships these days are very different beast from those of our own parents' generation, let alone a century or more ago when marriage was the be all and end all.
People - men and women - are brought up very differently these days and have very different ideals and expectations. Every individual and every relationship is unique.
Your argument might have held very true once, but it simply doesn't any longer. Relationships have evolved more in the last 30-40 years than they probably ever have. From 'living in sin' being utterly frowned upon to people jumping in and out of relationships, living with many different partners over the course of their life (serial monogamy), having children out of wedlock, having children with different fathers/mothers.
How and why is it OK to move on in all these different ways, but not in the way we initiate marriage? 
I have no axe to grind - I was proposed to in the traditional way, by a man who made it clear he wanted to marry me in our first week together (actually, he pretend proposed to me before we even go together but that's another story!).
But my way isn't the only way of doing things.
Take off the blinkers and stop coming to silly conclusions based on out-dated ideas and stereotypical generalisations which simply don't hold true across the board.