Here medicine is a good example. In others, opposition is less vociferous and moving in the direction of cautiously testing this new system. In high-energy physics a relatively small community handles peer review in an increasingly informal but rigorous manner. They seek fast information exchange and wide access to each other's latest ideas. Scientists in some other fields, particularly those in larger communities, prefer the traditional system of peer review, which tends to filter information and proceed more slowly.
Increased speed is fine, but what they really want is high-quality information.
In this context, less is actually better than more, or so they say. There is a continuum from initial, partially formed communication, on the one hand, to refined, thoroughly peer-reviewed, and published article, on the other hand. Before reaching this final stage, however, an idea will have gone through many elaborations and modifications. In fields such as physics and mathematics paper preprints were close, or even identical, to what eventually appeared in a journal. Now we have the capability to preserve, if we choose, a plethora of prior versions in electronic form.