It's narcissism. Hollywood hacks these days think they can do a story better than the white man who created it, in the case of The Witcher, Tolkien and The Wheel of Time. So they inject their bullshit into the stories and fail to capture what makes these IPs so popular and instead they tread all over the original works.
The fact that Henry Cavill was being adamant about the writers sticking to the story to properly capture the spirit of the story, should be a good indicator as to why the second season was terrible. Which is dumb because the first season was solid despite taking some creative liberties. The difference is that these people want to change the entire tone of a story because they don't happen to like the original creator for some asinine reason. It's cultural colonialism at its finest, taking an author's existing works which have sold millions of copies and coopting it into something that does a disservice to the original.
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It's Netflix, they'll hire anyone with a pulse these days.