Limited hardware is exactly why it is usable. Many e-ink devices exist now so limiting factors such as refresh rates etc, need to be considered when developing apps for android etc nowadays.
They might be maining that it requires a specific ereader model rather than being generic, but I'm not sure that really applies either. Kindles, even any specific single model of kindle, are generally readily available.
Limited hardware is exactly why it is usable. Many e-ink devices exist now so limiting factors such as refresh rates etc, need to be considered when developing apps for android etc nowadays.
They might be maining that it requires a specific ereader model rather than being generic, but I'm not sure that really applies either. Kindles, even any specific single model of kindle, are generally readily available.
Usable enough to run a Linux DE on it! I did so on my blog: https://nns.ee/kindle