-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.
Yeah but a baby has to be in the correct orientation and has to change orientation as it traverses the birth canal otherwise you’ll run into issues. An egg is rotationally symmetric along an axis so it’s much easier to push out. It’ll naturally rotate into the correct orientation and doesn’t need to be rotated.