BUR #6592 has been rejected.
create implication game_cg -> official_art
There are currently 42'060 posts under game_cg, 164'906 under official_art, 35'449 under game_cg -official_art, and 6611 under game_cg official_art. It seems we are using these tags inconsistently now, any many things that could be considered official_art are not due to having game_cg. Additionally, this is further complicated by things like Touhou's many fangames. Should art from a fan game be considered official_art? I would say yes, because game cgs are always "official" in the context of their game.
I propose implying game_cg to official_art. If it is undesirable to have game_cg imply official_art because of fangames, it would have to be gardened manually. If it is undesirable to have game_cg imply official_art at all, there should be a mass update to remove it from the posts it is already on.