I'd say arxiv isn't a superior platform. It is in that it is free, but it is the filtering effect of peer review that seems important. I'd say you don't need to actually filter, just some sort of measure of quality to make searching easy. I look for papers these days by hopping links on google scholar citations. This works well for finding good "older" papers. I want a mechanism for quickly finding good new papers. Then you have your superior platform.