Different “zones” still leads to boring homogeneity
?
Since I certainly do not make the difference if it's not juxtaposed like in the link you provided, I hardly think of a better way to underline such variety. The more so when you find your zone (or here, continent) "boring".
Now, I might happilly welcome new types of biomes like "savannah", but since I feel already overwhelmed by Civ6 variety I'm not sure if I would like it gameplay-wise. If anything, I would put more green, more wet, even at the price of an Ages mechanic. (however, biomes in Civ6 are good or totally useless, there's no middle ground, yeah, mountains, water -since you can't settle it-, deserts, I'm looking at you)
But, if there's no coming back, I would like for every civ to be able to profit from one particular biome like deserts, jungles, mountains, toundra, ice ?, coasts more like it is the case with Petra now for one civ and like it is the case now for civs uniques.
I could totally play a game where I can pick up a desert "unique" if I spawn near a vast desert after a period of exploration without being able to settle cities, even if it's not working like pantheons when once picked up, no one can pick it up anymore. It could be like an aptitude several civs can share, like Civ4 traits, and maybe that might bring them closer together. (unification ?)
Unless it is just a building/national wonder or a project, even if that sounds pure fantasy. After all, it's easier, cheaper and faster to conquer your neighbours than revitalising a desert like the Sahara or the arabian desert or any kind of desert. (since it's more difficult to conquer in modern era, it's more likely to happen there, like Saddam Hussein wanted to do in Irak by rebuilding ancient irrigation network, but american spies discovered it and America sent its army there to prevent this)
You know what sounds like fantasy too ? The ability to settle on water. But, since wonders effects for example are retroactive by essence, it could not be totally ridiculous to see a civ ability follow the same retroactive scheme : you can settle water because you "created" isles in it, albeit you just found them.