A 55-year-old man is referred for evaluation after his landlord threatened eviction due to the accumulation of items in his apartment that has rendered the kitchen and bathroom nearly unusable. The patient reports intense distress at the thought of discarding any of his possessions and describes a strong perceived need to save items regardless of their actual value. He spends hours each day acquiring free items from neighborhood listings and becomes very anxious if he misses an opportunity to obtain something. He denies any intrusive, unwanted thoughts that drive his accumulation behavior and states he genuinely values and wants all of his possessions. He has no rituals related to symmetry, contamination, or checking. Which clinical feature most clearly supports classifying this presentation as hoarding disorder rather than OCD with hoarding symptoms?