Sorry, but vanilla Civ 6 had twice as much going on in it as Civ 5 did with all it's expansions. Boy the first game of it was intense!!
THat is... absolutely untrue. That is not accurate at all. I'm sorry
While Civ 6 inherited A LOT of systems from Civ 5, they were often washed down, with the exception of few
- Great Works in 6 was a much more boring system than in 5, not only were they fewer of them, but they removed ALL themeing bonuses that made chasing them in 5 fun, in 6, you only had theming bonuses from Museums ONLY.
- Archeologists were also much washed down since they only dug up, and you only have 1 per Museum, meaning you can end up with A LOT of unclaimed sites without Theatre Squares.
- No World Congress in 6 without Gathering Storm, no Golden Eras even.
- Buildings are a lot lackluster in Civ 6 than they were in 5, even with the Districts.
- No late game ideology system (though that's understandable).
- Diplomacy was much more plain than in 5, leaders no longer taunt you as much (they only talk about their agendas).
- Trade Routes are also a much simpler, no more resource diversity, you just send Trade Routes and that's it.
- Terrain is slightly less exciting in 6 than in 5, in 5, certain resources and terrain types would remove yields, for example, a hill would not have any food on it, while in 6, all terrains are cumulitive (meaning you can get some pretty strong tiles, I never if ever build farms that aren't Wheat, Maize or Rice).
- Units were more sparse, no more Composite Bowmen or Landships.
- Tech Tree and Civic Trees in 6 was such a bad design, you can beeline so easily, and the dead-ends don't really do much. The layouts feel weird and awkward (though this is more a personal choice)
- City States feel a lot more nuanced, sure Envoys are nice, as are their suzerain bonuses, but you can't really do much with them, there's no competition between them, influecne doesn't decay,and are pretty much responsbile for yield overflow.
- Spies might not have been the most exciting in 5, but they were absolutely not exciting in 6 either.