>>28673001
Ive drawn a highly scientific and cited diagram to explain.

Tldr diminishing returns.

It's not a linear curve. I dont know the exact numbers obviously but at a certain point you stop gaining grip for adding a wider tire. You'll see the biggest gains going from say a 225 to 255, and then after that you won't see those same gains to say a 300mm tire. Not only that but you lose out on power to weight and adding unsprung weight.