See exactly what changed between two drafts - line by line or word by word, with old / new highlighted.
The everyday text work of writing day: how many words, what changed between two drafts, what the markdown looks like before you paste it into the CMS. None of it leaves the page until you copy it out, which matters when the draft is not yet ready for anyone else to see.
A re-save through a word processor can rewrite line endings, convert straight quotes to curly ones and reflow paragraphs, so every line differs before you look at the words. Compare plain-text exports where you can, and switch to a word-level view when the change is a sentence rather than a paragraph.
Compare your submitted draft with the returned version so you can see every cut and insertion in one pass, then accept or reject each one deliberately. Keeping both files is what makes that possible - if you overwrite your own draft, there is nothing left to compare against.
Yes, as long as you still have the earlier version. Put the current draft on one side and the older one on the other and read the removed lines - a vanished paragraph is far easier to spot here than by re-reading a long piece from the top.