HK is just a baby, with some good ideas taken here and there from civ.
Civ on the contrary, has been evolving ever since its creation.
Trying new roads every time.
Civ 6 is heavily oriented to new gamers generations, highly mobile, with no time or patience to play long gameplays.
If civ could account for its biggest weknesses for the next iteration, namely the AI not building units, city centers ultra powerful.
No supply lines, no roads necessary for supply lines. Late game would get a little better I Believe.
There's a LOT of work to do, and it need to take into account the STRONGEST points achieved sofar, and not DITCH them
just because it's something already seen that would prevent innovation.
A few weaknesses in civ 6 made the game the most boring of them all, but it made a lot of innovations also.
There's no easy road, just a peebles road where every stone count.
Roads and railroads, supply lines as in civ 1
Partisans, Economy and unit cap tied to city pop as in civ 2, plus the best complex tech tree.
Mixed armies and governments as in civ 3, plus building on mountains.
City centers as in Civ 4 (city walls give a buff to unit inside but no hp by itself)
Realistic graphic as in civ 5, plus naval combat.
Ley lines, Heroes, workers sacrifice, but may need to mantain a little more automatic, or help build roads, etc. as in civ 6
Civ Rev be like supply health bar for all units.
Civ 7: Squash the water, bigger rivers, early armies, no city hp, 9-10 altitude layers, sequoia giants, giant wales, roaming livestock for nomad gameplay...and less cards gameplay... maybe a little sim like where you can name citizens and have mini missions, like driving a car like simcity2000, move citizens around cities, industrial districts, hospitals strikes... would be super fun to actually get inside a 3d view at ground level...
Many games have an escalating power and escalating difficulty towards the final boss. Maybe there needs to be a final trial at the end. Like everyone ganging up against you.
Especially if you are going for a victory, I would expect every other single civ to gang up and try to smash you, beginning with cutting every possible supply line.
That would shut down every city. No energy. No fuel for tanks. Did you build strategic Fuel silos? If not, dark times awaits you...
Enemy civs would try everything to demolish your strategic improvements resources, destroy roads, airports... if that mechanic is not present, it's too easy..
I civ 3 usually, the weakest civs would get squashed be everyone. Get a civ to declare war on an another one was super easy. No stupid diplomacy mechanic or grevieance that
only works against the most fun mechanic that made civ 1-2-3-4 so successfull...