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DRS appears to work because only the following car can use it.
In the case of KERS and Push-to-Pass (when it has been used in the past) it seems most often the case that both drivers seem to activate the system at the same time leading to a stalemate.
Sure there are some situations where one driver has used up all his allocation before another and is therefore defenceless but from what I have seen that tends to be rare.