It's all well and good that you're comfortable with the "point and shoot" mode in which you operate. As long as the filament you use matches those specifications, you'll be happy.

Once you decide to try a different composition or the manufacturer changes the formula, or even if you change to a different color, you can run into a situation where the print will be less than optimum. It is that point where knowing how to use the settings will allow you to continue to use your machine.

Good luck!