“This series is 1:1 replica of a book” and “this series is only taking a passing inspiration from original books” are merely facts and a starting point to set expectations before moving on to describe and judge an adaptation. It’s okay to judge by comparing original to adaptation but “this is not a faithful adaptation, therefore it is bad” does not help in evaluating quality of derived work.
I’m not judging someone who read the entire series or those who did it multiple times. People are free to enjoy what they want. Regardless of that, doing 8 months multiplied by even 2-3 times is a considerable chunk of a human lifespan. It explains takes like “I don’t like the adaptation because it made too many changes” and it needs to be put into perspective. I’ve elaborated more on this in my other comment.