Having a mustache or a goatee will show what notch, Spanish and French points are useful for. The slight extension makes trimming around facial hair, nostrils easier and more efficient. IME. Humankind has always attempted to improve a design. The straight razor is no exception. Looking at the evolution of the monkey tail, straight to slightly curved scales, and the points being examples IMO.
Huh... and I always thought they were examples of intelligent design.