I know I'm in the minority, but I hope Civ7 gets rid of districts.
Perhaps scale back districts?
Some are absolutely vital. E.g: Canal.
I count this as one of the few examples of where Civ VI improves on Civ V. Because with canals you can traverse bodies of water on those real earth maps, etc.
Also the Harbour, which allows near coastal cities to build ships. (Previously you had to build a coastal city to do that).
But o/w I think you're right. Very few cities have been planned like Washington D.C.
Most like London, Paris, Sydney, etc. are pretty haphazard. Very rarely do you find cities with industrial zones or theatre squares IRL. Universities and research labs are frequently associated. (I mean how may tech firms spun out of MIT, Stanford, etc.?)
(I think power plants should be a district. E.g. Nuclear plants. They tend to be huge).
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My wish:
Card combat system (inspired by
Marvel's Midnight Suns).
I played MMS on a free-to-play weekend on Steam and absolutely fell in

love!
Just because 2K+Firaxis did a piss poor job of communicating this superbly nuanced game to gamers, I think it was widely rejected as a "card game" (which it absolutely is not. I mean Civ VI has cards for polices. That doesn't make it a card game).
But I suspect Card Combat for Civ VII is going to be hugely divisive, so I suggest 2K+Firaxis introduce it in a Civ spinoff:
Beyond Earth 2
