Hi there, thanks for taking the time to share your thoughts on this subject! I'm really glad to hear that you are in a happy, healthy relationship. I do agree that people are free to make whichever choice suits them, and anecdotally, there are always going to be couples (like you and your wife) who make certain choices and end up happy together.
Unfortunately, there are also many other couples who might make that same choice and realize it was a huge mistake. Many, many people move in together too quickly or with the wrong intentions, and find themselves trapped in a situation that is significantly harder to get out of than just breaking things off.
In addition, experiencing multiple domestic partners and having multiple relationships end (after that level of commitment) makes it significantly harder to trust future partners. This is why I believe that sharing a living space as a family should be reserved for one's spouse. I suppose those who do end up marrying the first and only person they live with bear the fewest of consequences, while those who go through domestic break-ups experience much more emotional trauma and hardship. Either way, it's a gamble that I, personally, am not willing to take.
There is a lot more to be said on the subject, but I'll end my response here. Feel free to continue challenging me on this - I am always open to learning from the wisdom and experiences of others.
Thanks for stopping by, and have a nice day!