Bests & Worsts Reviews from Amazon

I have a beloved fifth generation Kindle that has seen more than it's share of books. Receiving notice it would no longer be updated with new software and security, I purchased this one which arrived the day it was released. Big mistake. I had to update the software as soon as I received it. I downloaded a few books in my library for a plane trip - they would not open on the airplane & I kept getting a message I needed to sign into Wi-Fi. Why? The books were already downloaded. When I got to my destination I was able to open a book. For some annoying reason the word "highlights" appeared over certain sentences. Where they came from & how to remove them was a complete mystery until I read a review here from Sarah. After following her instructions I was able to get rid of highlights that others reading the same book had placed. Why would I want to see others highlights, Amazon? Even worse, it appears this procedure will have to be done for each book. Why should I have to edit highlights out of my books? Further, I sorted the books in my 5th Gen nto categories, making them easy to locate when I wanted to read a certain genre. Where did they go? Why didn't they transfer somewhere I could find them? So many reviewers are mentioning warmth, display, brightness, etc., as problems. All I want is to be able to find the books I already had in my library. And I want them in the way I sorted them, not the way Amazon is now presenting them, which is by series. I don't like this Kindle and am feeling the same way about Amazon.