I think the universe actually is perfectly balanced between antimatter and matter, but variation across space emerged as space expanded and our entire observable universe happens to be in a pocket where there was more matter than antimatter.

[–] Nomad@infosec.pub 2 points 1 day ago

Sounds reasonable. Assuming matter and antimatter split into equal parts that would have to be the case. I'm not sure if annihilation is a perfect process. Assuming energy density creates separation of energy into matter and antimatter of equal parts and no sudden annihilation happens, that would most certainly result in such a conclusion.