Chickens came first bruh; the just stopped laying fresh new chickens because eggs are easier. It's probably wrong to say they're "not chickens".
Humans came first too. In our own way, we only started **using** our human eggs in recent decades in an external environment. It's definitely easier, but humans have morality that chickens aren't burdened with.
Anyway, thanks for coming to my ted x talk about armchair evolution theory!