I've found that recently the personalized AI recs are just comparing the book to my recent reads. It will simply say whether the book is like or unlike the last 15 or so books I read and ask if I'm still in that mood. I feel like I could very easily figure that out for myself. I really preferred the older version of the feature where it compared it to other books you have previously shelved, even from years back, from a similar genre/topic and tells you whether this book might be a good fit based on those parameters instead. Not sure if this is something that can even be changed, but I figured I'd ask!