-Easier birth control: Make the egg into an omelette
-Relaxed child support laws: Requires deliberate decision to incubate the egg
-Clean packaged periods: Egg = No mess!
Although, there would be stories about partners hiding fertilized eggs: Instead of unplanned parenthood we would have unconsensual parenthood
There’s probably more nuances I am missing. But do discuss it in the comments.
Yes, my parents used to have chickens. It’s unlikely that the incubation period would be 9 months and being oviparous has It’s own challenges. If humans did evolve that route I’d imagine that we’d have overcome most of the issues. Dinosaurs being one example, it’s possible humans would be cold blooded and have learned the joy of regurgitation. It comes down to speculation whether human like intelligence could have evolved with these limitations.