there are a whole lot of things that can break in the water and become dangerous... sticks, masks in particular.

many current fins when snapped end up with sharp plastic edges... try running a pair of stratos across your back when they've snapped, there is some hard plastic out there.

fibre fins have been used at worlds since 2004 at least, to my knowledge. where exactly is the "ruling" from that you've quoted duck? was it just a verbal thing in sheffield?

benson is right, the stuff they are using is coated in resin and essentially already has a covering layer... perhaps someone who has experience with broken fibre fins could help here?

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