I don't think anyone really has any insight into it since it was pulled. You can usually have pretty good luck getting in touch with Apple Engineering if you file a bug report online:
https://bugreport.apple.com/
"
Bug Reporting
For issues not mentioned in release notes, file bugs through
Apple Bug Reporter.
When filing a bug, please include the full version number in the bug title and in the description. This looks like “10.14 (18A
xxxx).” You can find the full version number by choosing About This Mac from the Apple Menu. In the window that appears, click on “Version 10.14” displayed beneath “macOS” to show the full version including the part that is in parentheses."