They appear to be to be a massive waste of paper, and their narcisstic authors could just keep their thoughts to themselves. But no, they think they HAVE SOMETHING TO SAY that the world is breathlessly waiting to read and in most cases, that is not the case.
Recommend that they self-publish and distribute the dosens of copies to their friends and relatives and quit stuffing libraries with their output.
Just the humble opinion of the OldPossum.
Flame and belittle the non-literary OP if you wish; possums have tough skins. They also are known to snarl back.
There’s a surfeit because there aren’t very many good editors, let alone many who actually read the drivel they print! On the other hand, there are innumerable truly spectacular books that never catch the limelight. It’s more a matter of right place, right time.