One of the serious drawbacks of Civ7 is poor visual clarity. In particular, it is almost impossible to distinguish cliffs in the in game graphics. Players often end up wondering why a unit cannot move, then only realize the reason after zooming in and checking manually.
In Humankind there were also cliffs and escarpments, but they were never this difficult to recognize. Why is that?
The reason is that in Humankind each tile actually has its own elevation. Tiles with the same elevation naturally form continuous height levels, which effectively function like contour lines.
Cliffs, valleys, and hills are then built on top of this foundation. This approach is not only visually appealing, it also greatly enhances strategic depth while solving the visibility problem. Elevation must be introduced to Civ7, and it should be used both visually and strategically.