Why campaign units use different stats comapred to the normal game?

Playing the campaign is a good way to learn how to play the game.but most of the units in the campaigns had their bonus damage cut in half,and food cost drastically increased,RTS game campaigns like starcraft 2,warcraft 3 at least,had their basic units like marines,orc grunts,being the same stats with the normal game(except you can modify them in starcraft 2),However the aoe4 campaign units getting their bonus damage nerfed makes the combat very clunky and slow,Archers having only +1 damage to light infantry,spears takes longer to kill cavalry,can we get the campain unit stats updated to the normal game unit stats?