What about caring for users? If I know X is vulnerable I can decide to disable X by default for all OpenBSD users without needing to know the details.
Knowing the details would make the difference between drastic and inconvenient mitigations (maybe no graphics at all) and just "disabling legacy drivers and lose the setuid bit".
If after my warning hackers start focusing on X, my users are already on the run: it isn't a problem for them.