In reality, the number of blades alone does not guarantee a superior shave. Several factors come into play: skin preparation, the quality of the lather or soap, blade angle, and pressure applied. Even the best razor will cause irritation on poorly prepared skin.
Multi-blade razors can deliver good results, particularly for those seeking a fast and low-effort shave. However, because of the multiple simultaneous passes on the skin, they may cause redness or ingrown hairs, especially for sensitive skin types.
Conversely, manual shaving with a well-sharpened single blade, when mastered, can provide a closer, gentler, and often more skin-friendly shave. It does require a bit of learning, adjustment, and above all, a willingness to slow down.
There is no universally superior method: some will prefer the ease of a modern multi-blade razor, while others will choose the precision of traditional shaving. The key is to select a technique that suits your skin, pace, and personal preferences, focusing not on the blade count, but on the quality of your approach.