My griefs are a little more general but in the same veins, and some connected to things that have been idiotic since the game first came out:
1. Barbarians in general. They are still (in another Posters great term) "Mindless attack bots" with no other purpose - except, of course, they give you some opposition when the AI governing other Civs is so inept. It's probably a Radical Concept in a Historical 4X game, but I'd like to see Historical 'Barbarians' for a change: Barbarians you can trade with, or hire as mercenaries, or befriend as well as or instead of fight, and who have the potential to occasionally found a City and become something else besides perennial bothers.
2. Trade in general. Right now, the game still has two completely separate Trade Systems: one for luxuries and other Resources connected to mindless AI requests/demands and utterly independent of the map, and one for generic Gold, Production, Food and Road-Building that is map-dependent but utterly independent of relations between the two terminal cities short of all-out War.
3. Combat. It's long past time to retire, bury, and drive a stake through the heart of 1UPT: the AI is utterly unable to move or fight its units.
4. Units. The Unit Promotions/Classes system is both Fantasy and Fathomless. Warriors can never pick up Spears and learn that "the pointy end goes into the enemy"? Pikemen can, some of them, pick up muskets but never any other personal gunpowder weapons? No group of military men anywhere in the world can ever learn how to move fasteror see farther unless they are Scouts? WTH, Firaxis, just WTH.
5. Victory. We STILL don't have an Economic Victory? So all the Markets, Trade Routes, Banks, etc in the game are just to feed some other Victory Condition? They have, apparently, tried to 'improve' the Diplomatic Victory possibility in NFP, which was ghastly, but I haven't seen any comments yet on whether the change works as intended or not. BUT the 'end game' whenever it occurs is still too often a mindless series of turns slowly accumulating some arcane set of factors to finish a Victory already won. In 3000 + hours of playing Civ VI, I don't think I've actually Completed To Victory more than 1% of the games I've played past Turn 100: life's just too short to waste it spending hours mindlessly clicking "next turn".