I’d vote against that. All roads come with “last edited” information which, in Merkaartor at least, is easily visible. All lanes on "De Hogt were last touched july/september 2010, except for one that’s of march. This should be plenty clear for any mapper.

Also most nav-systems I know that have been updated are all perfectly aware of the new situation, so by now the signs should read “Outdated nav-systems off”