I've written a MacOS kernel extension. The API is a underdocumented mess. I understand why they would want to remove it, even it is just to eliminate the API

I've written a MacOS kernel extension. The API is a underdocumented mess. I understand why they would want to remove it, even it is just to eliminate the API burden, but, that means the last resort to add functionality that Apple hasn't deemed appropriate is closed off. That's truly unfortunate.