Civ VI: I think the counters/advantages between units (cavalry/melee/anti-cav/ranged) should be more drastic to make each one equally valuable.

Right now, cavalry is king, followed by ranged, then melee, and finally anti-cav units, who are VERY situational but mostly terrible. Cavalry units can do everything melee units can with double (or more) mobility making them the first choice evey time. Unless you plan on playing completely defensively, it makes more sense to go head to head with cav and ranged units instead of making the proper counters. Anyone who plays a lot of multiplayer knows this is almost always the case.

I think the advantages and disadvantages should be more drastic, promoting more tactical, chess-like battles instead of the unit spamming, brute force battles we currently have. If you attack like an impatient idiot, a clever, strategic player should be able to defeat an army triple his size. I'm tired of seeing sythia/sumeria/rome/kongo/India completely annihilate another player who has no viable counter just because one got the unit production pantheon and only focused on spamming units and the other, God forbid, actually tried playing other aspects of the game.

Also, there should be more of a difference between light and heavy cavalry units, along with light and heavy infantry. They should recieve their own separate attributes and shouldn't be lumped into one general class when their roles historically were drastically different. Light cavalry should be much faster, but have a lower defense, heavy cavalry should be more restricted, ect.

If all of the current penalties and bonuses were increased by 5-10 points, we would have much more interesting battles. Ranged units should get destroyed by light and heavy cav, and should always need to be protected. Now you have to pick which unit to protect them with. Maybe an anti-cav protector for ranged units on the flanks vulnerable to light cav charges, but not in the center when faced with infantry who will easily wipe them out. I think this would make the game much more dynamic and unpredictable, and also allow you to focus on other parts of the game instead of making an equal sized army when there's an aggressive player.