I think you misunderstand the math here. Parabolic is very slowly growing compared to exponential as time increases.

Take any graphic calculator or app and plot y=x^2 (a prabola) and y=2^x (an exponential) and you’ll see one grows way way way way faster than the other.

The reality is that all exponential things eventually either go to zero (in the decreasing case) or stop being exponential (in the increasing case). Why? Because exponential growth eventually becomes so large we run out of physical things such wildly large numbers could represent…compared to exponential growth, even the number of atoms in the universe is small…