It doesn't feel great reading this thread as a lesbian mum. My child's birth certificate record's her mother and her second parent as my wife and not the details of the anonymous sperm donor. That birth certificate doesn't record her biological/genetic parentage. But it does record her legal parents and importantly her social parents - the women who look after her every day and take responsibility for her upbringing and wellbeing.
Arguably biological parents should be stated as they are important for all sorts of reasons.
I can see an argument for also having legal parents named but I don't think it should purely be a substitute for.
There seems to be this rather human desire to 'know where we came from' genetically. It's part of the story of how we came to be (see separated and adopted children and the popularity of family history).
However another legal parent is very much part of that history and heritage and should be treated as such. This is a bonus rather than taking aware from parentage or having 'lesser' status.
I wish that this was reflected in documentary papers as its the story of a person's origins and heritage and purely factual rather than a statement of 'ownership' of a child which I feel is how this is going. It shouldn't be viewed as a judgement - it's merely the reality of a chain of events and decisions which led to a child being born.