Aristos
Lightseeker
Civilization VI is not a strategy game, nor simulation game or immersion game.
It is a dopamine loop system of addictively filling buckets and having a constant sense of futile accomplishment, where the player needs to be rewarded and cannot be punished.
It is afraid to provide drawbacks and negative modifiers, to the point of supposed "dark ages" having their own set of bonuses. The expansion is called Rise and Fall but you cannot fall. That would be unpleasant sensation.
Why invest in such things as capable AI? It's a difficult investment in a system which has no shiny buttons, sexy advertisements and worst of all: it is potentially detrimential to the casual pleasure.
Some part of the playerbase finds it alluring, to the point of insane praise give to how in civ "there are so many ways to win".
Yeah, because there is no way to lose. There is nothing at stake. There is no drama of challenge and joy of victory.
That's here we are: at a shallow, colorful pleasure generator; a board game where almost every move is a winning move and choices don't matter.
After all, games such as Darkest Dungeon, Dwarf Fortress, Dark Souls, Divinity: Original Sin or Kingdom Come: Deliverance have proven that challenge is detrimential to the satisfaction.
Also, programing good strategy game AI is impossible and Vox Populi is fake news hoax conspiracy of frustrated haters to put Firaxis in a bad light. Such mod never existed.
Sadly, you are right, and probably in more ways than you think right now (or maybe you are thinking the same as I am but not saying it?). I know some people may "feel" offended by this, but hopefully we can argue rationally without making this personal. The reality seems to be that we now live within the "Instant Gratification" era (Dark or Golden, your choice...). This core "attribute" permeates everything, from cars to fashion to attitudes to, of course, video games. In that sense, ironically, Firaxis can be "forgiven", as no one in their right mind can ask them to go "against the audience" and produce something that the majority will dislike. That is why we get "more shiny" and "less substance", not only with Civ post-Four, but with anything and everything else. Sad, but true.
In other words, we get what we deserve/want as an audience, even if not all of us fit that description of audience. It reminds me of an old, wise Spanish saying: "Cada pueblo tiene el gobierno que se merece" (Every society gets the government it deserves). The same is true for any market, or product: Every audience gets the product it deserves.
That is, from my point of view, why we get a parody of an AI.