Maybe omegas would have evolved to be more fertile and able to safely carry more offspring than humans irl, while betas would have evolved as a subgender whose job is to manage and care for the omegas when they’re in vulnerable states (pregnant or nursing or in heat 👀). And other subgenders (like enigmas) would be adaptations/mutations which would have evolved during scarcity of a certain subgender!! Interesting stuff indeed!