When restoring any number of page revisions from deletion, the log entry shows the number of revisions restored (this is MediaWiki:restore-count-revisions). When deleting a page, however, the interface at action=delete does show the deleting user the number of revisions that will be deleted, but after that the number is gone. It would be great to have that in the log, as it would make comparing the two easier.
That is, if a page was deleted and then 42 revisions were restored, it's not clear to editors whether that is all the revisions, or whether some where left deleted, or even whether previously-deleted revisions were restored as well. Similarly, sysops are in the blind as to what revisions were deleted as the number.