Why does Canon Continuous shooting allow only Manual strobe at lower power levels on FJ units?

In order to prevent misfires due to recycle rates and prevent TTL lag while using a fast continuous capture frame rate, the FJ triggering devices eliminate the communication required for TTL by switching to Manual and maintain strobe power levels that assure the flash recycles in time for each successive exposure.  For higher power levels or TTL operation, set the camera to single shot.  

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