According to whom is your work diminished? Apply a little reductio
ad adsurdum and you realize that ALL your creative work is inevitably
diminished because the whole history of the postwar hobby involves
the constant production of more and better models, parts, etc.

If you mean only that the monetary value of your work is diminished,
well, that may or may not be true. Depends on the item. And on those
despicable collectors who bid up the value of the merchandise.

Tim O'Connor