One of the surprises I got when doing that was realizing that Y's code was terrible because of how X was interacting with it, and a rewrite of X allowed a rewri

One of the surprises I got when doing that was realizing that Y's code was terrible because of how X was interacting with it, and a rewrite of X allowed a rewrite of Y, and I was able to delete half the code in each. This has occurred countless times. But that doesn't stop black-boxes from being created faster than I can fix them, unfortunately.