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While there are clear advantages to children having same-sex role models there is no requirement that the role model be a parent.
Requirement no. Advantage yes.
It doesn't actually matter what is "best", what matters is what is possible. The world doesn't run on "best", ever. It runs on "good enough" or "better". When people push for the ideology that I read as you asking for us to agree on, the results tend to be harmful.
You say "two parents that birth their child and stay together are best". The words gets twisted "being a single parent hurts your child"; "having a step parent hurts your child"; "having same-sex guardians hurts the child". Then the policy gets made that harms even further, "same sex couples cannot adopt", "divorce is illegal"; or, the lesser form, harm is caused to the child through broken families who have been tricked into believing that "it's good for them to stay together for the sake of the child".
Stances and arguments and acquiescing to those perspectives has a tendency to walk down very harmful paths very quickly; and, if it's not your intent to push or argue for the policies listed above, it absolutely is what the people you're referencing will push or have pushed, or people who come after you will push.
Living with both a mother and father can certainly have its perks. The main one being easy accessibility to a role model of both sexes. There are plenty of other situations that would provide that same advantage though.
Families come in all kinds of configurations, especially when you get into multi-family/generational living situations, none of which is inherently better or worse for the child by sole virtue of the sex of the those involved.
Child A living with a mother and father isn't guaranteed to be better off than Child B living with two fathers. Just like Child B isn't guaranteed to be worse off than Child C who lives with a mother and a grandmother and a grandfather even through there are benefits to having more people in the home caring for and watching over the child. If you didn't grow up in a household with both your parents and grandparents you didn't have that advantage, but you weren't disadvantaged because of that either.
It's like saying that having two kids, one a boy and one a girl is "best". It absolutely has its advantages sure, but that doesn't make it best or mean that anything other than that is "worse".
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[0]: https://www.forbes.com/sites/roberthart/2023/03/06/kids-rais...