I agree, If reproduction coins are made to look too realistic, and not made out of metalic covered plastic, (as you have suggested) then a very great number of heartbreaking "miss-sales" will occur, both (knowingly and unknowing).. This can only result in great unhappiness for a very large number of future coin collectors.. If the Titanic had blatantly revealed as many obvious problems as, (overly realistic, and easily tampered with reproduction coins) it wound never had been launched.. The only question that I have is, how did this crazy anomaly ever happen?.. What an obvious own goal overly realistic reproduction coin are...
