I remember being only 7yo and us all studying the Revelation book (first edition). I sat through every book study just looking at the pictures. That was a deep book... bullshit of course, but deep shit.
Now? It's all pretty pictures and rhetorical questions in big letters.
I dont see what a newly interested person could get out of it if they were looking for "deep bible knowledge". Even the study edition of the Watchtower is, literally, the same stuff we'd studied over and over but dumbed down.