I can't see how arXiv helps with the outlined problems. The goal of publishing is getting a stamp of approval from your peers, which you can then bring to hirin

I can't see how arXiv helps with the outlined problems. The goal of publishing is getting a stamp of approval from your peers, which you can then bring to hiring or promotions committees to buttress your case. Arxiv merely helps you put your paper online, which I would argue is a trivial problem (and has been so since the personal university homepage was invented).