Your Civic DX example is a good one but that's a spec-line problem, not a process problem. The ITAC should make a decision re: whether derivatives belong on the same spec line - thereby authorizing update/backdates among them - or on different lines. If the answer is "different lines," then it does become a warts-and-all issue.

I'm not terribly confident that the various Hondae spec-line placements are the result of comprehensive planning and decision making, so it might deserve review.

K