Originally Posted by javyn
It's more effective. Applying lather to your face with a shaving brush is better because the hairs on the brush will hook and lift up the hairs on your face, the shaving cream holding them in place, just ready to be cut. Better than, say, lathering foam/gel with your hands, which would flatten the hairs against your face, making them more difficult to cut.
And the idea is that a shave soap or cream uses water...