We first take a look at tanks and bot. T1 and T2 tanks are different. T2 tanks have problem to counter the dox and boom bot, so T1 tanks are still necessary in late game. And of course, player can also use slammer or Dox to replace the T1 tanks. T1 and T2 bots are different. The T2 slammer are better than Dox to clear the T1 units. But T1 bots can attract the high damage bullet from leveler, sniper, bluehawk, catapult. So T1 bots are still useful in late game. I just want to ask this question. Should I replace T1 fighter with T2 fighter in late game? Is there any advantage to keep producing T1 fighters? Or I should build pure T2 fighters instead of T1 fighters?