Most marketing tools only ever add new pages. Bloomkeeper also looks hard at the ones you already have, because a weak homepage costs you more than a missing suburb page.
The ones that matter most:
It does not review everything. A page nobody searches for is not worth your time.
Each page gets a score and a plain-English summary of what is wrong, then asks you to choose:
If a page is already ranking on the first page of Google, Bloomkeeper will never suggest replacing it by default. Rewriting a page that Google already likes is one of the easiest ways to lose ground. It will suggest improving it instead.
This is the one part of Bloomkeeper with no automatic mode at all. Improve and replace both produce a draft, and that draft waits for your approval no matter which mode you are in.
You do not have to decide on every page in one sitting. A page is only re-scored when its content actually changes, so your decisions stick and the list stays stable.