The new Williams says "G" simply means lots of gear and short falls. Difficulty or strenuous placements are separately noted and not taken into account for the gear rating.
I've told many people of numerous Gunks 5.9s that are very safe if you hang out to get the gear but can become very dicey if you skip the placements. I consider it part of climbing at that grade, not as affecting the gear rating.
But one could always define it differently, as long as it's clear what it means.