On the contrary, the courts have gone into elaborate detail as to all the harms caused to children when you deny their parents marriage. And all the benefits to children when their parents are allowed to marry.
The benefits to those children make my proposal far better than 'useless'. Where as Sil can't even explain how denying marriage same sex parents helps their children. Or any child.
A set of married parents means a father and a mother. You only hurt a child by giving him a mockery of what he needs, in place of what he really needs.
Here are some of the harms caused to children when you deny their parents marriage:
Windsor v. US said:
And it humiliates tens of thousands of children now being raised by same-sex couples. The law in question makes it even more difficult for the children to understand the integrity and closeness of their own family and its concord with other families in their community and in their daily lives....
....DOMA also brings financial harm to children of samesex couples. It raises the cost of health care for families by taxing health benefits provided by employers to their workers’ same-sex spouses. And it denies or reduces benefits allowed to families upon the loss of a spouse and parent, benefits that are an integral part of family security.
Now, with some of the serious harms listed, tell us....
how does denying marriage to same sex parents help their children?
Sil has never been able to give us any credible answer. And instead insists that they should be harmed. Perhaps you can do better.