Honestly, I have lost hope at this point.
Firaxis is either completely incompetent regarding AI/diplomacy, deluded and oblivious to the problems of their own game, or cynically doesn't care about those aspects.
I am so ****** tired of this stupid excuse "the game is only x months and years old, they will suddenly make its core features much better, just keep believing" - this attitude is what allows companies like Firaxis on getting away with garbage like this.
Terrible AI and bad diplomacy is not the issue of only Civ6. It has been an issue since release of Civ5. It's seven years and Firaxis still shows no will regarding improving those aspects. SEVEN YEARS!
On civ5 release back in 2010 (!!!) AI was unbelievably bad and later patches and expansions merely managed to desperately patch it to ordinarily bad state, and it took modders working on .dll code of the game to make its AI decent (which btw is double fail for firaxis because it removes excuse of "it was impossible to make ai of this complicated game okay" - no it was, and Community Patch achieved this). Then we got Beyond Earth which AGAIN had terrible AI and diplomacy (as well as its own fresh problems which all together caused this game to die surprisingly quickly). Then we wait for civ6 and AGAIN we get horrible AI and diplomacy. A year passes, AI is still horrible and some people still have desperate hope that Firaxis will suddenly wake up, after SEVEN YEARS of turning its ai into garbage, and make its ai good.
No it will not. Firaxis needs major kick in the rear end, or change of crew, or change of leadership. Until that happens, you all can only be deluded from patch to patch and from expansion to expansion that artificial stupidity which was immense for years will suddenly magically become decent.
Frankly, at this point I think the attitude of "just wait, they will eventually improve AI" is not merely silly, but downright destructive - it allows Firaxis at doing what they do. Maybe if forums were united in their anger at the state of (lack of) challenge in this game somebody up from here would finally say "Beach, we have a problem".
Anyway, for me at least, misery of those aspects removed most of fun from civ6. Why bother about animated leaders when they are shiny shells hiding utter stupidity? Why bother about strategy at all when your opponents are so braindead you basically have to invent house rules for yourself to not overwhelm them past early game unfair rushes? Why bother about new DLCs and civilisations when you could overcome those machine fools with "generic civ, no bonuses of any kinds" just as easily?
"Definition of strategy: A method or plan chosen to bring about a desired future, such as achievement of a goal or solution to a problem."
For me at least, the challenges offered by civ6 are way below the threshold for strategy, and it'd be fine for me if it low difficulty was the design, but it is the result of incompetence.