Let me put it this way: there is "publishing" and there's Publishing™
Before electronic communications became popular, publications would publish "letters to the editor" which were kinda like an informal paper with a partial discussion or results (some publications still do that, btw).
My point here is that Publishing™ took place of simply publishing to share results with your colleagues and now the main objectives of Publishing™ is to dodge picky reviewers and to get your publishing score up to get more grants
Thank FSM for Arxiv and for researchers sending "drafts" or "unofficial" versions around