I've been extremely happy with mine. There are contrast limitations, of course, but you quickly develop an eye for what works on it and what doesn't. But sure, you can't just throw any picture on there and expect to get away with it.
I suggest one could buy an EPD tablet - you can find 13'', 300 PPI - and build a nice wall mounted (or table sitting) frame structure for resting.
(Setting the "power off" picture in Android (you do not need the OS to be on to display the picture) can be an ugly process, but there may be workarounds)
The article writer is attacking unspecified providers that are promising more than it is deliverable - not the technology.
> High prices, unclear specifications. Unclear business model, subscription based, phone app dependant, making you bound to their service. These devices may easilly become useless if (when) the company closes its doors
Most of the article is spent on explaining why e-ink is unacceptable for art and why no-one wants this. Clearly nonsense. I want an e-ink display for showing art, regardless of the quality.