I see what you mean. But with biology, every organism has a different biology. I can take a plant or an animal and study its biology as an external and impartial observer.
With respect to the question of the existence of everything, I can't take the Universe or a Universe and study its properties as an external and impartial observer.
If I was the only organism in the Universe, I could still try to study my body and reach limited conclusions, like we do with physics, but I couldn't go further without dissecting myself or injecting myself with potentially hazardous substances, which would kill me. And I certainly would never be able to answer the question of where I came from if I didn't know about the concept of gender, sex, and reproduction, which I couldn't know about if I was the only organism to have ever existed from my point of view.
If I asked how biology worked, you wouldn't say "Survivorship bias: if biology didn't work, you wouldn't be here to ask the question."