Board Thread:General Discussion/@comment-63.249.41.72-20150316033558/@comment-24891101-20150407224039

The lip syncing is also translation convention. We can hardly empathize with the characters if something like that does not line up. The same applies to any written text we see.

Everything presented to us in any fiction is carefully selected and dramatized, compared to what actually happens in-universe. This is the best way to explain away inconsistencies or stupidities (Zwei).

Of course, this is really because most creators can't be bothered to generate as much material as is necessary to create a proper world, nor do they have the expertise to do so.