One criticism or specification I have for flexible machinery is that in some of the examples shown in the video, it does limit certain capabilities of those devices in order to add value in some other way.
With the vice grip specifically, the flexible substitute is not able to adjust the grip ratio, nor does it have the lock and release mechanism that a metal vise grip has.
With a more advanced design of the flexible vice grip, maybe you could replicate those functions. especially if you start to integrate certain synthetic materials that may change property is based on perhaps electric or magnetic fields. And there's no reason why you can't use metal components in conjunction with flexible components in order to leverage the strengths of both designs.