Society has evolved now LGBT have the rights to marry. Living together never equaled marriage. If it didn't make a difference the Supreme Court wouldn't have ruled in favor of marriage. Children born out of wedlock will always face shame because marriage makes a difference. Maybe not as common but still occurs. Children born out of wedlock are not accepted in some families. Legal relationships have benefits just ask the Supreme Court.
my parents didn’t legally marry until I was 10 and I am still not legally married to my son’s father, we are happily sharing a life together without a piece of paper. I never once felt shame that my parents didn’t have a piece of paper for the first 10 years of my life and neither do my kids . Yes marriage automatically gives you some legal rights . Tax breaks and the right to make medical decisions, and that is why it was important for marriage to be legal for all couples, but it does not automatically make a family and it does not guarantee a happy family. Only two people who are truly in love and committed, two people who are willing to fight through the hard times that is what makes a family and that is what children benefit from , not a piece of paper. I totally understand why people get married , and maybe one day we will get around to making it legal , but my generation and generations that came after mine do not shame people for not being married .