Earlier quoted context omitted.
You are seriously giving authors too much credit. The vast majority of the journal papers require enormous amount of production editing -- that's exactly why the EICs and societies sold those journals to publishers. Things that I have seen : ( wife was a production editor, I briefly helped an EIC of a society journal that was sold to a publisher ) 1. Graphs do not fit the page or space allotment - journal is uses two…
1 is mostly things that the publication team is asking authors to fix by email for modern journals. Most journals will have a template for these emails, or stick them at the back of the reviewer requests. 2 Is something that I have seen caught in peer review twice, and missed once. Again, it would usually go in a batch email to the authors of issues that need to be fixed before publication. 3 is definitely something…
P.S. Average STEM paper takes about 30 hours to "produce".