Ruth, I think it helps if an institution has their own style guide with details about style, including punctuation. Then everyone knows the standards by which the work is corrected. That way you are not just subject to the style of the proofreader. Of course, there are optional matters where we have some choices, like that last comma in a series of units. I have been forunate in that I have never worked at a place that was so picky as to style.
Punctuation is a matter of style and that can vary a lot.
Some docs put commas all over, some never say comma, period, etc. If they aren't getting these corrected in the final copies, then I wouldn't be overly concerned. I see it at our service each day. Also, as we have seen, styles and preferences change.