Why save it for another thread? Because I am trying not to hijack the thread. (any further)
The primary purpose of the grounding electrode system is to dissipate fault current to earth. Fault current created within the system, while it will conduct lightning for an instant it isnt installed or required for that purpose. But thats off topic.
For clarity we arent talking about a stand by system, emergency system or camping we are talking about a seperately derived system. Seperately derived systems require bonding to the grounding electrode system.