It's been relegated to the adult dungeon. A general title search won't show up anything in there (as far as I know; I don't write such stuff). You have to be searching specifically in the erotica category for a title there to be displayed (again, so far as I know).
Neither poster was looking for his or her book, in the sense of trying to see if it was being offered. Each had the ASIN and thus knew the book was there. What they were perturbed about was not being able to bring it up while using the search window.
That almost certainly stemmed from their mis-typing the title, or, if they did type it in correctly and the book was lost far back in pages of listings on various keywords, not putting the title in quotes to see what that would do.
I may be one of the few people left in the country who walks about without a phone. I carry one only when I travel afield, which is infrequent, and then only to let people who are expecting me know if arrival times, etc., are running on schedule.
I don't like being tethered otherwise.
Now, it's true that I live alone, am not now in a relationship, and my kids are grown and married and off in other states living with their own spouses and children. Were any of those circumstances different I would probably then carry one.
Anyway, the net is that I never have to read a post, email, news story, book, or anything else on a tiny screen. Nor am I ever intruded upon when I'm out and about, which is vastly my preference. A little extra blessing in my life.