Something that isn’t yet in the game, and might be good for infantry, is the diea of camoflage. maybe a purely-infantry option, a module that goes into the slots for armor or shields, but means that unit is camoflaged instead. it could make that unit harder to spot, when enemies are selecting targets, and would toggle off for a period of a few seconds when that unit opened fire. Maybe it could be combined with a new ‘no weapon’ option to prevent them giving away their position.
On the plus side, obviously it means infantry might make it through the map without being hit, on the minus side, it means zero armor, and also means that they would (to be effective) lose all offensive capability. If balanced, it could be quite interesting. It could possibly be extremely heavy, effectively making camoflaged units forced to move slowly (to repserve their camo status), although that might not be intuitive?