Is it really never, or is that in relation to complex low voltage setups? I replaced my main panel earlier this year. They very intentionally grounded to hot &

Is it really never, or is that in relation to complex low voltage setups? I replaced my main panel earlier this year. They very intentionally grounded to hot & cold water and iron gas pipe in multiple places plus at the copper water supply entrance. Externally there are two buried rods. From what I recall the NEC requires all of that for every installation.