So, here's what I promise you.
I have a plan. I have always had a plan. I planned out the basic premises of all six books before I started writing book 1, and I've known how the whole series will end before I started writing book 1. Have there been some changes to my plan along the way? Sure! Have I come up with new and different ideas as I go? Of course! Has the story evolved somewhat organically once the ball got rolling? You bet! But I have striven very hard to keep everything pointing toward the ending I planned out six years ago, and that has helped me to write a story that is coherent, logical, and enjoyable. You, the reader, can trust me. I take your feelings into consideration, and as long as I CAN work something in that I know you want, I WILL. Everything that you think "means something" probably in fact does, and there really is a "puzzle" for you to figure out. AND I have beta readers already lined up to read book 6 when I finish who will let me know if my plan has been executed to satisfaction and whether or not you, the reader, will feel fulfilled by it. I don't want to let you down, and I think any author who puts edginess or shock value above the needs of the readers has lost his/her way. I promise to give you an ending that has a eucatastrophe, an ending that makes sense, and an ending that has, really, existed all along.
One of my favorite bands has a recently-released album entitled, "The End is Where We Begin." Good advice for any author, especially an author with thousands of people riding on his/her books. At the end of the day, I don't want my readers to close book 6 and say, "What was the point?" And that is clearly what has happened to this author.