[nv-vn]

As someone with very little knowledge of the language, I definitely agree with your first point. It's hard for me to figure out if the product would be useful for me at my level since there's no "Easy" book available for free. I imagine that for an advanced learner it would be similar not knowing whether there's actually any new knowledge to be gained at their level.

[fuzzythinker]

Actually, there is a book marked as "Easy" for free [1], it's 5 pages.

[1] https://languageinmotion.jp/library/10

[njrc9]

nv-vn, as fuzzythinker pointed out, an “Easy” marked book has been added to those you can read for free. Hope that helps!