Testing every possible failure mode of a simple full byte wide adder is in fact pretty non-trivial and hard work.
Troubleshooting everything that could theoretically go wrong when asking Alexa to add two numbers is simply impossible or incredibly expensive.
Space shuttle computers for autolanding are possible although testing suites are expensive, as you state. Implementing that process to the same level of reliability using a vast distributed software technology like Alexa would be essentially an infinite cost.
Its a given level of reliability problem; can't compare the apples to oranges of extremely unreliable software or even worse, networked, solutions to something as relatively cheaply reliable as hardware.
Troubleshooting everything that could theoretically go wrong when asking Alexa to add two numbers is simply impossible or incredibly expensive.
Space shuttle computers for autolanding are possible although testing suites are expensive, as you state. Implementing that process to the same level of reliability using a vast distributed software technology like Alexa would be essentially an infinite cost.
Its a given level of reliability problem; can't compare the apples to oranges of extremely unreliable software or even worse, networked, solutions to something as relatively cheaply reliable as hardware.