It’s too basic.

No folders, no ability to freely arrange things, so your app drawer is everything, and unorganized. Same with the home screen.

Which, I guess that might actually work for an eink device now that I think about it (just bought a poke 5 myself), particularly one that’s only going to be used as an ereader rather than a general purpose tablet with an eink screen.

There’s just a minimum degree of organization that becomes a problem when it isn’t there, and the device needs to be easy to use. But, yeah, I think you may have just countered my “useless” opinion. It might well be perfect for that use case, both in its bare minimum features, and how lightweight it is.