My input: so far I greatly prefer what was shown of Humankind.
1) After playing Humankind, civ6 feels so horribly slow, clunky and overcrowded. Rough terrain everywhere, units moving essentially one tile per turn, constant traffic jam everywhere. War of conquest is pure pain with cities and encampments shooting at you every few tiles and borders being fill to the brim with a chaotic set of units.
Meanwhile Humankind felt so
C L E A N
S M O O T H
T A C T I C A L S P E E D
M A N E U V E R
3) Civ6 generally has too much of everything. Literally everything. Tons of resources, special map features, disasters, city states and their unique bonuses, great people and their unique bonuses, religion building, districts, improvements, housing, amenities, congress, special units, corps, adjacencies, diplomatic favor, alliance metres, era points, loyalty, tourism, archeology, great map density filled to the brim with units, ton of random agendas and
diplomatic actons - TOO MUCH. By "too much" I mean "too much tedious or pointless choices, piles of bonuses, instead of macro scale strategic dilemmas".
Look at how Humankind does warfare. You get few simple rules - high ground, rivers, forests, sight, Simple special abilities, walls - and those simple few rules create a lot of tactical depth. A choice between settling a new city, resource outpost or attached outpost? Simple and yet such a major strategic choice. Less but more.