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It was years ago, but I do recall using some of the tiger:cfcc tags when doing some rail classification and “better tagging” (as in existing rail tagging conventions that didn’t exist or weren’t paid attention to when TIGER data were imported, or those that evolved in OpenRailwayMap tagging conventions years after the import), as I have cleaned up thousands of miles of USA Rail that came into OSM by the TIGER import, and that tag proved useful in certain wide-scale OT queries: quite helpful, I recall. I agree that for the most part, tiger:cfcc tags seem “junks” or “useless” (as @DUGA says; welcome to Discourse, DUGA). But as can be true with such data, we don’t know all possible cases for how or when they might be useful. And as in some cases (rare, admittedly, but in the case I note above, actually do happen), they are useful, because they (surprisingly) can be.

Until, as with tiger:reviewed and then we review the data and it becomes “fine enough for OSM,” and then it is absolutely proper that we delete it. I agree with @aighes that “if it is already correct, it doesn’t need to be further corrected.” The other data? Let’s continue to discuss, as “which tags might be disposed of has begun.” We should be careful, though: we must try to imagine use cases, but that is fraught with the danger we don’t imagine everything possible, quite a likely occurrence.

I’d say tiger:zip* could be deleted with a mechanical edit (and yesterday). There is no reason for these data to be in OSM, whether they are, might be or are not correct. It’s simply incorrect for them to be in OSM; no need to make a determination if they are “correct.”