The word "reissue" is a pretty broad term in itself anyway. It refers to the repeat issue of a product "which has been released at least once before and is released again, sometimes with alterations or additions." <--so a reissue with alterations or additions are still classified as reissues. Reissues are also known as re-release or re-editions, and certainly changes can be made between different releases or editions; hence why the edition of a book is often cited in bibliographies.

The Japanese term for reissue toys is "Fukkokuban" (復刻版) - "fukkoku" means "reissue" or "re-release" and "ban" means "edition" or "version." So it implies that there can/may be differences between it and previous editions (as with books etc.).

I think we need to delineate the difference between a reissue and a replica. It seems to me that your idea of a "perfect" reissue is one that is a near-perfect replica. Just out of interest, would you consider reissues with overlengthed missiles and/or stripped chrome missiles to be reissues? Because I don't consider these reissues to be quite unsatisfactory and displeasing replicas.

All replicas are reissues, but some reissues are better replicas than others. Some reissues don't even attempt to be replicas and have intentional changes made to them - so they do fail as being classified as replicas, but they would still technically count as being reissues methinks.

So for example:
+ First Predaking reissue = replicant reissue
+ 2nd Predaking reissue = non-replicant reissue

Blade Runner'd!