Comment by colechristensen

Indeed, with sufficient thrust your wings can just be flat plates with a small angle between the plane of the plates and the direction of travel. Airfoils are first about reducing drag, second about stall speed and angles.

But airplanes are quite constrained things, if you have a bad attitude and refuse to use airfoils many planes wouldn't even get off the ground and all the rest would have abysmal performance. Sort of like how with imagination everything is a hammer, but this being technically true doesn't mean that you shouldn't really use a hammer when one is called for.