Flame units > Infantry
Rocket infantry > Mech (Tanks, APCs, etc.)
Tanks > Buildings and Bullet Infantry (you can run them over, lmao)
Pill Boxes > Infantry
Tanks > Pill Boxes
Howitzers > Buildings
Anything that moves > Howitzers
Bullet Infantry = Spam spambamman
Dogs > Heroes and Spies
Bullet Infantry > Dogs
Rocket Anything > Aerial Units
Lack of energy > Tesla towers, lmao
etc etc etc. and it was all very intuitive. My point is you didn't need a big UI in RA showing you 20 stats of each unit for you to figure out how to use the entities in the game and who they were good at killing.