About units

most of players using tanks light medium tanks everywhere maybe bomber planes too but noone using high level ınfantry units in game

especially I dont want to use ınfantry units cos they need too much production time mostly totally useless why should I wait for 1-2 days to get ınfantry unit I can spam tanks and planes can help maybe I can use some artillery or railroad guns ıf enemy has high anti air power but ınfantries ?? what will I do with them ? attack to cities ?? other units can do this in game

and as extra mostly players dont prefer to product anti tank units cos they dont need this there are a lot of units for this artillery railroad gun bombers rockets

so why ınfantry and anti tank units are useless in game ? they are similar with strategic bombers