Parmandur
Book-Friend, he/him
I still don't understand WotC's aversion to lower page count, B&W soft cover books (or even full color) since 3.5 first became a thing. Something like that would be perfect for these things.
WotC has talked about this: the books sell as meaty art objects as much as rule books (again, they've made the rules available for free without art). There is maybe some money to be made with small, low-art books, but there is more to be made with beefy, art-heavy products that, say, a four year old or two year old can get a kick out of, generating more future players.