Kubrick as an excellent observer might have seen and shown too much. Even his first large successful movie "Dr. Strangelove" showed some secrets like the interior of the B-52 and especially the usage of its decryption machine. Some people were quite upset and didn't know back then how Kubrick knew about that. Maybe some people's lack of humour about EWS costs his life? However: If you watch at Kubrick's prerecorderd talk for the Griffith Award in March 1997, he does not look very healthy:
[link to pages.prodigy.com]