The AI is still dropping passive decoys when it would be best to drop actives. It's a boarderline case, but the penalty for dropping passive decoys when they should drop actives is much steeper than if they drop active decoys when they should drop passives, since they will usually easily clear the datum by the time a passive seeker can get in range of where they were.
With this database and the evasion geometry, the passive decoy won't really help the AI get away from passive torpedos, they are essentially redundant. However, in many situations where they drop a passive decoy when they should drop an active it is a fatal error.
So, if the passive decoys aren't really helping the AI subs evade the torpedos in a significant way, due to the fact that the seekers are really short range for quiet submarines and they clear the cone using their evasion patter, then there is no real downside to having the subs drop only active decoys.
This is based on a set of tests tonight only, but I highly doubt that passive torpedos will be made effective against submarines even if they never drop passive decoys.
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LW
 
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