No, opto controllers can have BEC, witness the Castle Hydras. But BEC kinda defeats the advantages of opto coupling. Opto means "That the final stage drivers to the motor are optically coupled to the lower level stage. Often, this is done with infrared components within a single integrated circuit (IC). This produces a very high level of isolation between the controlling stage and the output so that no feedback from the motor can get into the ESC."
Bottom line, it reduces interference from high powered motors and reduces glitching.
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