This is an amazing development in material & surfaces. Great hunt!

Of the use-cases put forward by the video, I think the mobile phone cover is the least inspiring.

The tread changing on tyres is much more interesting, and will/would create much more impact. If you had a road car, with "standard tread" tyres, which could change depending on the surface, that would be astonishing. Instant snow tyres - or off-road tyres for mud, or the desert/sand. Even subtle changes for motorway/highway driving in the rain - to cut down on aqua-planing.

There are just so many potential use-cases for surface/material tech like this - you could easily write a 10,000 word post on the possibilities (and still not come close to exhausting all the ideas).

Truly remarkable tech, with massive potential.