[ggm]

Holo glitter works in the radar domain. So, its passive tech which has an effect.

EInk has a refresh time. Which is a significant mismatch to the flight speed of devices which seek to mask themselves against changing background. More to the point, optical detection is the least worry in this space. by the time it's visible in motion, its already a problem. '

For on-the-ground, its easier to put it under a canopy.

EInk does nothing for radar, or thermal imaging. So your proposed conspiracy is to defeat human eyes, which rarely if ever are the first-spotters. The circumstances where using radar breaches your own privacy are understood. I would expect an ML vision system could defeat this anyway. (and I say that as a bit of a long-term non-believer in AI)

I love a good conspiracy, but alas, I think this isn't it. The grassy knoll is just, after all, a patch of grass, and not an EInk facsimile, in my personal opinion.

[derefr]

Not from below. From above. IMINT countermeasure, to make countries with imaging satellites take longer to notice you flying silent over water into their airspace (presuming you've already got MASINT stealth covered, and are moving onto higher-hanging fruit.) Gives aircraft the same long-distance stealth advantage a sub has: they don't see you coming until you're there.

(Admittedly, I was being a bit silly with the missile use-case.)

[ggm]

Being able to retint your visible spectrum view from 10,000ft and above would be useful, I agree.

I occasionally see referrals in flow text to a Chinese claim they invented "holographic quantum" radar and can see all current stealth low echo aircraft and subs. I suspect it's bullshit but in war, if stealth was a purturbation, and deep water subs a more historical perturbation toward MAD and now, this is another perturbation much as drones have altered the symmetry for tank and mechanised ground warfare.. "shrug"

[hattmall]

Could be great for low altitude drones and helicopters though