Yes , that's a big difficulty, but then you take into account the conditions they struggled under.
Perhaps the only person for that area who was qualified, working by candle/gas light, and having to guess how a name is spelled.
Then a transcriber comes along ..and attempts to make sense of the returns...
I cetainly wouldn't like the task of transcribing the BMD records on Ancestry from the 16th Century on.
Must have been a thankless job, and probably still is.
Spring