The Lord of the Rings: The War of the Rohirrim is the next in the ever-growing list of Tolkien adaptations, and it must learn an important lesson from its two most divisive predecessors if it hopes to succeed. The legendary fantasy author put extraordinary detail into his fictional world, making it perfectly equipped for various spinoffs. Hollywood has taken advantage of this with varying success, which means audiences are weary of War of the Rohirrim. However, so long as it avoids what has made The Hobbit trilogy and Prime Video's Rings of Power so controversial, it will be okay.
https://screenrant.com/lord-of-the-rings-movie-mistake-avoid-canon-change-war-rohirrim/