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I get both your points.
I'm pretty sure a separate ground rod would effectively reduce the chance of a lightning strike. I also found in the NEC where supplemental ground rods not bonded are allowed in some instances.
On that note, I thought about it and the shield of the coax goes to my 3 televisions. That shield is grounded to my household electrical ground. I am guessing that creates a secondary path to ground that may or may not become the path of least resistance for some of the circuits in the house. That might prevent the plug in surge protectors from working properly.
I'm conflicted and plan to do a little more research before going a particular route.
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