Duplicated words counted in rewrite

The writing process can be complicated, long, and can require several edits. It would be great to have more transparancy on how words are counted in some sort of tracker. If AI rewrites a large section and only updates a small portion, not all word should be counted because some of them were already counted. For example, if I have a list of characters and I tell the AI to add a new character, when I click rewrite, all of the information is written again, but the only new words or for that new character. I should not be double or more counted for words that were already counted.