That's the simple version of it yes. I outlined a more complex version of it in a parallel answer. In short: lacking a complete specification of what to do, it'

That's the simple version of it yes. I outlined a more complex version of it in a parallel answer. In short: lacking a complete specification of what to do, it's often impossible even within software teams to tell whether something is a bug. And you never have a complete specification of what to do.