My only issue is that the Eye requires introduction, which takes time and reader investment, and then never shows up again. I left the stuff with Hux and Pryde because they’re both characters throughout the film, and their scene helps introduce us to both of them, to Kylo, to the First Order and its structure and attitude, to where the plot is headed, and sets up the dynamics of all three characters in relation to each other. The Eye just sets up, well, the Eye, and I think having Kylo talk to a mysterious ancient thing he doesn’t fully understand treads on the toes of Kylo talking to Palpatine.
I feel like these kinds of characters sometimes show up in stories and fairy tales though. Like a wise old hermit or a witch that tells the main character something important about themselves and then vanishes. Of course, this would be the first time something like that appeared in Star Wars.
EDIT: For example, there is the witches from Macbeth. Of course, they appear more later on in the story. But there are other examples as well.