Well, I finished it. I don't know if knowing it was the final Discworld book affected things but I did cry a bit several times during it. Plus my guess about the spoiler was correct

Given Terry's enormous output over the years I feel this was a good way to say goodbye, the themes in the book definitely cover that area.
I think the afterword was the single most depressing thing I've read dealing with fiction:
The Shepherd's Crown wrote:We will now not know how the old folk of Twilight Canyons solve the mystery of a missing treasure and defeat the rise of a Dark Lord despite their failing memories, nor the secret of the crystal cave and the carnivorous plants in The Dark Incontinent, nor how Constable Feeney solves a whodunnit amongst the congenitally decent and honest goblins, nor how the second book about the redoubtable Maurice as a ship's cat might have turned out. And these are just a few of the ideas his office and family know about.
Personally, in my own selfish way, I will always curse the universe for denying me the Moist von Lipwig novel where he is put in charge of the tax system.
The Daily Mash wrote:DEATH has been told it is not allowed to take Sir Terry Pratchett until an investigation is held.
Following the passing of the author, the final ferryman has been suspended and will be held to account by an independent body before making any further decisions that are patently wrong.
Deathologist Roy Hobbs said: “Any rational person would agree that only after the publication of another 30 Discworld books, at least two of them starring Rincewind, would it have been correct for Terry to die.
“And for this to happen only two years after the death of Iain M Banks, leaving a number of massive Culture novels unwritten, smacks of incompetence.
“At this point the Grim Reaper looks less like an implacable, unanswerable end and more like a haphazard dick on roller skates swinging his scythe about like a fat kid at a piñata.”