Used to name arrays, at one point had a hell of a problem because we found out that we had no way to consistently name, and thus communicate, PCI-X I/O-bays (it was a big POWER server...)

But if a pet "melts", well, the pet died. You moved the functions over to another pet. Whether it's a move from Zeus to Jupiter, or rebuilding your precious cattle management system on eu-central-1 after us-east-1 burned down and you got slapped with data locality requirements, is less relevant ;)