Problem is that the comments are sorted by date, so if people check latest comment they would either see comments on page not yet validated or (if we exclude these pages from "all comments") maybe never see these comments in the latest comments, as they would already be old when the pages are validated.
(I'm not sure if it is clear?)
Of course these could be stored in a separate table and moved to the real comments table when the page is validated, but I never took time to make that...