Civ IV (and all previous versions of civ), allowed you to turn given cities completely over to City Governors (including what to produce). That included not only conquered cities, but self founded ones. In fact that is what puppets in Civ V amounted to, you being forced to have a governor run the city until you clicked the annex button plus a series of penalties you'd have to pay should you click that button.
But people often complain about the governors. I understand there is a choice and all that, but I don't really miss not having to micro all those cities.
With global happiness gone, I wonder who sort of penalties they will use if let's say there is no puppet option.
I still think some sort of lack of control of conquered cities unless directly annexed still makes the most sense.
I don't see anything in Civ6 about going back to microing a ton of stuff, but it's certianly possible they'll allow it to please some fans, but may limit districts to say, half the max allowable, say 6, and or apply a blanket and large malus on city output of science, culture and taxation given it looks like the happiness system is really not a
