Opener's rebids are natural.
The benefit of the Herbert Negative is that it saves bidding space. The traditional negative response is 2NT, which consumes more space and "wrong-sides" the play of the hand in no-trumps.
The drawback to the Herbert Negative is that it takes away the natural, positive meaning of the cheapest suit response. To bid the suit naturally, responder must make a jump-bid at the 3-level instead.
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