See my sibling comment. It matters because it's a very strong (to academic/industry researchers) sign of quality and whether the paper is worth reading. If you

See my sibling comment. It matters because it's a very strong (to academic/industry researchers) sign of quality and whether the paper is worth reading. If you wanted to just put something out there you could just put on arxiv. The authors are academics (?) so they clearly want to publish in the best possible venue.