The recent announcement to reject review articles and position papers already smelled like a shift towards a more "opinionated" stance, and this move smells worse. The vacuum that arXiv originally filled was one of a glorified PDF hosting service with just enough of a reputation to allow some preprints to be cited in a formally published paper, and with just enough moderation to not devolve into spam and chaos. It ha…
In my experience as a publishing scientist, this is partly because publishing with "reputable" journals is an increasingly onerous process, with exorbitant fees, enshittified UIs, and useless reviews. The alternative is to upload to arXiv and move on with your life.