Publishing math is one of the most time consuming things ever, between the submission, review/revising, and editing. I with there was a faster way of doing it outside of arXiv. Without having to review the paper closely, typically an experienced editor can tell at fist glace if it's correct or sound.

It is what we could call the “zone of occasional poor practice”. Included are actions like

I think this is more common in computer science papers. I see this all the time, where 5- 10 authors will collaborate on a short paper, then collaborate on each other's papers in such a way that the effort is minimized and publishing count and citation count is maximized. .