Why didn't they abstract it, or create a stripped/safe userland option to replace it? If I'm relying on a Mac for work, I can't have them removing essential features from my computer in a simple upgrade. Maybe MacOS needs semantic versioning, or at least some level of communication with the end user about compatibility.
This was never an intended feature. If I understand the article correctly, they were using an undocumented ("private") API which happened to stop working.
Every API is undocumented on MacOS, what do you want them to do? How are you supposed to discern between zombie XNU code and Good LTS Apple Compliant code?
