The Warsaw Pact armed forces relied heavily on organic anti-air systems (ZSUs, MANPADS, IR SAMs, etc.) in the 1970s and 1980s. They were cheaper and easier to deploy than sophisticated interceptors and fighters and a perfect counter to NATO reliance on attack helicopters. At the tactical level, they don't rely in an integrated air defense system and are responsible only for local defense.
While I disfavor many people drawing a lot of inferences from the old Soviet armies, I wonder if this is one legacy of WP doctrine.
(BTW--great article.)