Ingrams path produces such people because his path is broken. Look at the results. He had a novel idea for how to “optimise Buddhism” and it had bad results
I don’t really think it matters what Ingrams favourite books are if his methodology has been so destructive
For what it's worth, Ingram himself recommends Kornfield's "A Path with Heart" as one of his favorite books, which is largely about how the goal is to be a better person and that's not the same thing as developing incredible concentration abilities and having intense experiences.