Yes and no. For better or worse, the Peter Jackson movies are vastly better known and consumed than the novels are, similar to the relationship between the MCU films and Marvel Comics. I think the adapters are probably making the wise commercial decision to go with what makes the movie audience happy, when they have to choose, rather than the book audience.
And most of the book people are still going to watch, much like my friend who sits beside me at every MCU movie and gripes about all the continuity errors from the comics, and not listening to me tell him it's a parallel universe every. single. time.
That kind of decision is inevitably going to frustrate many of the book fans, in both cases, but when you've got corporations and billionaires looking over your shoulder, not doing the commercially best thing would be very hard.