Have you done any service work lately, and noticed a spark as you connect or reconnect the grounding electrode conductor to the ground rod of what appeared to be a perfectly normal electric service?
There's something oddly comforting about the idea of fixing things yourself. You save money, learn something new, and get that little rush of satisfaction when it all works. That is, until it doesn't.
When you upgrade wiring, swap out an aging panel, or add new circuits, inspectors are not just glancing at the work and signing off. They expect a paper trail that proves the installation is safe, ...