Verify the result
A smaller or cleaner PDF is useful only if the document still has the structure you expected.
Editing, exporting, OCR, compression, and cleanup can change more than file size. Page count, dimensions, rotation, searchability, blank-page status, page profile, or metadata can also change along the way.
Change Receipt gives you a before-and-after structural summary so you can review those changes instead of assuming that the modified PDF preserved everything important.