At the interconnection point between your house and the utility cable,
there are surge protectors that must be grounded, otherwise they are
useless against a high-voltage spike that comes in simultaneously on
both wires.

Quite true. I guess I didn't make my point clear enough. Also, any
antenna grounding or lightning rod system is to be bonded to the power line
ground. Ditto for "cable TV" (that's the one that often isn't grounded.
Also, often the TV "dish" isn't bonding to the power ground. They all
should be bonded together.