What possible use is this? Metasurfaces are cool with many applications. Brainwave reading is cool, but it's not a muture tech yet - we can do little more than

What possible use is this? Metasurfaces are cool with many applications. Brainwave reading is cool, but it's not a muture tech yet - we can do little more than on off switches. So Metasurface + Brainwave = double good? I understand it's harking to some future world where we control matter with our thoughts, the ultimate technology - imagine it and it is made real.... But we are so so so far from that and this does not get us any closer.