Behind almost every headline-grabbing demo in the Physical AI industry sits the same truth: the machine is a prototype, and prototypes are not products. Building one working robot is an engineering feat. Building the thousandth one, at a cost someone will pay, without a team of specialists standing by to nurse it through a malfunction, is a different challenge entirely, and it’s one the industry is only beginning to confront. That gap, between demonstrating intelligence and manufacturing it at…