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Is your thinking that benefits of preprints mainly come from (1) speeding up initial distribution of one important idea/result, (2) reducing cycle time for others riffing on that initial idea, (3) qualitatively different mixing of ideas in the riffing period, (4) something else?
(1), (2), (3), (4)^infty. The arXiv also slows things down, makes things more homogeneous, and has other negative effects. In this particular case it started a whole lot of things happening years (decades?) earlier than they otherwise would have.
Cop out! One must be more juicy than the others... I like your anyon example because my hunches are usually in line with (2), but it's a stark case of (1). Though now I think about it, my hunches on (2) may be general about the internet rather than int. preprints in particular.
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