This is partly an AI slop issue but partly just a Boomers with no taste issue. Even pre-LLMs I can't tell you the number of self-published kids books I've read that are garbage, and they all fail in the same way (soulless art + way too wordy). Editors exist for a reason!

Boomers Can’t Stop Gifting Their Grandkids AI-Generated Slop Books
Parents are getting fed up with garbled bedtime stories that feature characters based on actual photos of their children.
wired.com