AC cable

I don't exactly disagree, but that argument applies to everything. Someone may book a green wire to hot and someone could die. I don't think we should put too much stock into what some unqualified hack might do.
Even a great electrician can mistakenly connect a red conductor in a cable to a hot leg. A green conductor, not likely unless someone is color blind. IMO since the right cable is manufactured and available the NEC should prohibit using a re-identifed red conductor as an IG.
 
It is but if your labor rate is high there is no savings using green tape. Not to mention if someone mistakenly hooks the red conductor up to a hot leg someone may die.
Whenever I have done that, I stripped every inch of visible red insulation to use as the regular EGC, and I used the green as the IG conductor.
 
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