Here's my benchmark at 3440x1440 using a 6900 XT showing 71% GPU bound:
And here is another at ultrawide 4K showing 99% GPU bound:
My own theory in regard to this is that the 3090 and 6900XT have so much muscle, that they are shifting the GPU bound resolution from what was historically 1440p over to 4K. I know there are still some newer games that are still GPU bound at 1440p but this game is a few years old now isn't it. Also, SOTTR is known to be particularly demanding on the CPU so that could be coming in to play in some way.
I'm not sure if you've seen other cards at that level 99% in this benchmark or not at 1440? I upgraded from a 3600 to a 5800X and saw a huge performance increase of over 25 frames in this benchmark at 3440x1440.