I dislike dragon scales as they are. It implies that dragons are near invincible, and having a material arguably better than mithril (with being hard to craft arguably more of an advantage than a disadvantage; Vinculi would certainly know how to work it but other nations wouldn't) this just seems far too excessive.

The idea of giant dragons in general is one that I vehemently oppose as being too far into the realm of magic and absurdity, so making derivative materials and super-strong dragon scales only firther offputs me.