Your analogy is actually really poor. The point is establishing a standard based on impossible expectations. With the standards that are set it would be pointless to ever try to adapt works of art
This isn't an adaptation, it's fanfic. Bad fanfic since any actual fan would consider the whole "mithril or we die" thread to be unbelievably stupid.
The idea that Elvish souls could dim is so far out of anything remotely like canon I'm shocked they actually approved it.