In science, an unpublished paper counts for nothing. They are only allowed for discussion here as they do often constitute anecdotal evidence for the claim or argument.
Actually, publication is simply a means for dissemination, and peer review is merely a noise filter for quality control (which both papers discussed here already passed). The same is also used for quality control of Wikipedia and discussion topics on this site.
Dissemination filters must however not be confused with science or the scientific method! What matters in science are facts and theories, and the verification or disproof of those theories.
Entries for further reading can be found in: