Even for signage it has some spectacular failure modes. Where LCD would just not show anything, the e-ink will keep the last (and invalid) information confusing everyone in the process.

Some of the eink displays linked here have 12s refresh, and it does a super annoying flash black/white process while refreshing.

Then you are a niche case. In order to forward a new technology, the masses need to adapt it. Apple, for instance, had to upscale the manufacture of Retina displays by starting with a proven successful product - then moving it to the iPad, then moving it to MacBooks.

We had e-book readers for e-ink, but they stayed at a super slow refresh rate. There was no reason to create a tablet sized e-ink display until the ReMarkable removed the issue of the delay.

Now we will have clones of that, and after that we will see a push to larger displays.

Mass manufacturing is hugely about cost balance vs. demand.

I think digital whiteboards in offices would be a great market for this. Again, though, if you’re going to draw on it at all there needs to be zero latency.