Cheap, lighter to carry around, take up less space (concealable I would think), make less noise, don't need a key, still plenty strong (can use multiple sets on stronger people).
I don't think they should be used by everyone or in every case but they make sense for some characters to have instead of metal ones. If they are being used as the default by a general cop on the street then I think the author needs to examine why they are being used. They are more wasteful, not as secure, and could easily cause damage to someone if not used properly so a real-world police force wouldn't use them in most situations.
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