I agree about some of the questionable plot holes and Reva not being a great character. However, given the context of the story it makes complete sense for Obi Wan’s character to be in his current mental state. His entire family that he’d known for almost his whole life was almost completely eradicated with the help of the apprentice he had trained since he was a child. He then had to confront and (from his perspective) kill the boy whom he’d developed such a strong connection with over the years by dismembering him and watching him burn alive. The empire hunts down anybody force sensitive and kills them or turns them into Inquisitors. Then in this story, he finds out Anakin somehow survived being burnt alive and is on a mission to find and kill Kenobi. With all that in mind, it makes sense for Obi Wan to be shut off from the force and suffering from severe PTSD in the story.