If you're team doesn't have a tank, you are guaranteed to lose

Made this assumption a few days ago, turns out I was right. Just had a game where the enemy had more kills and assists + less deaths and still lost. I said to them at the start of the game, "GG, you guys have 0 tanks, we have 3." One of their teammate's reply, "I don't need your taunting, I have work in an hour." Anyways, we won even though none of us carried, most had matching kills and deaths.