>>280218711
I think it is more of an inherent downside of the modern western idea of monotheism where everything needs to comply with christian dogma.
Monsters from non-christian cultures were allowed to just exist in the world and interact with other stories in an organic way. They do have weaknesses but they are usually just silly curiosities or customs only relevant to the cultures that created them.
Western folklore is not really allowed this kind of creativity. Every story needs to either fit a very strict mold or feed into a single narrative, otherwise it gets erased from the canon. As a result, every monster ends up with every weakness every similar creature presented in every story they ever featured, because they all must be the same creature regardless of context or meaning.