In the original Anacreon, some planets (like underground worlds) were harder for infantry to attack and others (like ocean worlds) were harder for infantry to defend. This was a good feature and it should be brought back and explicitly included in planet descriptions.

Since there are more types of infantry now, it would also make sense for each type to have different levels of effectiveness depending on planet type (e.g. armored infantry might perform poorly on ocean worlds and basic infantry perform poorly on fiery worlds, etc).