No, it doesn't have to be, but so far it is. What's annoying is that many of these articles don't give Gabaldon any credit. Even with changes, this is still her story and people need to be aware of that fact.

It goes without saying that when a book is transferred from
the page to the screen, the film makers will put their own unique mark on it. OF COURSE there will be trivial differences. That doesn't change the fact that Outlander will always be Diana Gaboldon’s story and she deserves to be recognized for it. Not to…

Then I don't think you read the books very well, as her character was always unlikable. I couldn't stand her. Jamie was never truly interested in Laoghaire, as she was described as being immature. Wasn't it Dougal who said that she would still be a girl at 50, or something like that? Jamie needed a "real" woman, he…

ATTENTION all people: This series is ENTIRELY based on a BOOK!