When two people form a couple, there are various types thereof. Nowadays, there are many couples in many places of the world who do not get married and yet form a perfectly fine family. So the date when that relationship started should still be shown, as it is currently.
However, a marriage (civil or religious) is something more formal, and is considered by many as very different from a mere relationship. Especially those who decide to get married, would probably insist that a marriage is different from just a relationship.
Therefore that difference should perhaps also be reflected in the tree, and not only once you look up the details page of that relationship. Maybe the oval line could be in a different color, like for example green.
Just a thought
When two people form a couple, there are various types thereof. Nowadays, there are many couples in many places of the world who do not get married and yet form a perfectly fine family. So the date when that relationship started should still be shown, as it is currently. However, a marriage (civil or religious) is something more formal, and is considered by many as very different from a mere relationship. Especially those who decide to get married, would probably insist that a marriage is different from just a relationship. Therefore that difference should perhaps also be reflected in the tree, and not only once you look up the details page of that relationship. Maybe the oval line could be in a different color, like for example green. Just a thought