>>27850858Ditto breeding has been around since they introduced genders and breeding in the first place.
Having a female hardly makes breeding any easier in the first place. Figuring out egg groups and trying to capture a father from another species is much more complex than just getting a ditto, and most children wouldn't bother anyway.
By making female starters more annoying to obtain, all they do is slow down people trying to get egg moves bred into a starter. That's basically it.
And since Ditto breeding is so easy, they instead incentivize trading through the fact that you can basically duplicate your starter and swap around with friends, without actually losing your original Pokemon.