Not a disagreement, more of a yes, and: “interested” may not necessarily be personal interest, and the subject of hyperfocus might not be a personal interest. I

Not a disagreement, more of a yes, and: “interested” may not necessarily be personal interest, and the subject of hyperfocus might not be a personal interest. It can also happen manifest, for example, as obsession with solving some work problem or chore which isn’t appealing at all until begun. Or even some unrelated yak shaving tangent that fits none of these categories.