Over the years that I published (in a humanities field), I was astonished by the rapid decline in copy editing quality at even top publishers like Oxford University Press. They stopped budgeting for specialists, and started contracting out copy editing to people who couldn't even tell apart common non-English languages. I started getting back "final" proofs with diagrams in the wrong order or with the wrong captions, and was so dearly tempted to just sign off "looks great!" like they were expecting me to. If only it wasn't my own reputation on the line if I let these things through.