OK I’ll wade into the deep end and if I offend you, please don’t be backward in coming forward.
My life experience has meant I was at a birth, but I was neither mother or father but I was a lot more than significant than auntie or friend.
I see most of this issue as a conflict between ‘what is’ and ‘vanity’. ie there is only 1 egg provider and 1 sperm provider < this should be the ‘birth’ certificate or at the least ‘what we are made from’.
Then there’s ‘Vanity Plates’ - who wished made ‘us’. My parents were amazing. I was / am an amazing parent. Neither of these is a biological fact.
My sperm donor made me, my fathers raised me.
We need to put down vanity and realise a birth certificate is only recording an actual history.