How did the author of such amazing books as Ender’s Game and associated books, the Homecoming saga, and Alvin Maker series end up such a boring, innate writer in his later years?

The book is 90% dialogue and when the climax of the book came, it was so uneventful that I was sure it wasn’t the real ending and that it would end as a cliffhanger instead.

Plus, giant questions that never got answered. >!Why was Ivy-O taking pieces of foliage? We get speculation but no answers. How was Laz able to replicate Ivy’s powers but not vice versa? Why did original Lazarus disappear? Where did the brain scans of them from their late teens come from, if neither remembers them?!<

I rarely reach the end of a book without finding something redemptive about it, no matter how small, but I was bored and hated it the whole time and found nothing to like.

Is there something I’m missing or misunderstanding? Did anyone like this book?