There has been research of sensor of finger gestures in the air. “Ring” is such a product. Finger gesture in the air is artificial and human may need some time to become familir with it. It also requires development of a new language of gesture.
On the other hand, humankind used to finger movement against some solid surface (paper, face, wall, etc) in her long history. Shiseido’s finger sensor senses the pressure anbd movement of finger against such surface. Human has developed dexterity for such surface faced gestures. Sensors for finger movement on a surface is realistic. No new language of finger gestures is required. I think Shiseido’s achievement is more impactful for human future than finger gesture in the air.