I'm really not understanding what on earth anyone can have against including Gold as a resource.
Gold (not even named "Gold Ore" - just "Gold") has been a resource in every single game in this series except Civ 6, coexisting with the yield Gold. Players somehow have always been able to comprehend the distinction; do you think they suddenly can't?
Why does its inclusion suddenly need some grander justification beyond resource variety?
Clearly the change was made for a reason, either to try to pull back on that tradition and better distinguish the currency unit from ores that were really just superficial luxuries; or because they were eventually going to
do something with bonus and luxury resources that they didn't want to do with gold ore; or perhaps because they were planning to reintroduce a "revamped" gold ore with some gold ore specific mechanics like those that I suggested above.
I never said I was
against gold ore as a resource. But I do acknowledge that next to the other luxuries, gold ore wouldn't really stand out as anything special when Spices/Sugar, Dyes/Tobacco/Incense, Silk/Coffee, Jade/Marble already provide identical bonuses, as do Silver/Diamonds which almost assuredly would share the same bonus with Gold Ore (not to mention the many near similarities between luxuries like Salt/Wine/Furs, Mercury/Turtles/Tea, Olives/Whales/Ivory/Gypsum).
It seems pretty obvious to me that Gold Ore was just incidentally left out and then never added back in because
merely as a luxury resource it doesn't add much mechanically to the game that isn't already achieved by Silver/Diamonds. It simply wasn't worth their time, the same way that they didn't think it worth their time to make Prague, Vienna, Pagan, or Samarkand city-states outside of the scenarios. It would probably need more than being another Silver to justify the development cost, because as far as they are concerned, they already put it in the game. If players really insisted on making it a resource, they could use the assets which already exist and write a quick mod to put it in,
and that's exactly what they did.
Another thing to consider is that we could feasibly see scenarios reworked into game modes. An outback game mode would include the gold resource for those who really want it, and would just require the inconvenience of playing every game with something resembling a gold rush.