Getting back to the OP, there is research to suggest that low-gycogen training can be beneficial. This is not the same as bonking. Though one hears the term "bonk-training" bandied about it's mostly used in the context of going out fasted in the morning with only water, which can be beneficial for sure but has nothing to do with real bonking.
Sports nutrition: the latest research into low glycogen training
Science of Running: Evidence for Doubling, training in glycogen depleted state