So, after the sidebar, I wanted to go back to the OP.
One thing I’ve found frustrating about modern books (other than my previous gripe about editing for readability) is the popularity of the big fat multi-novel story - and the consequences of these trends. Now, I am totally inconsistent in that I enjoy reading said BFMNS - but it has two flaws that drive me up the walls. The first is you read the first book, you get invested, and then wait 4-5-6 years for the next one. Robert Jordan was probably the first one I had the issue with, as I got into the series with the first novel. And while he wasn’t as bad as some (… Rothfuss I’m staring at you…), finding myself having to go back and reread from the start each time he got a new book out was one of the reasons I burned out on his work.
The other reason I burned out on his work is that in a BFMNS, the author has no incentive to actually finish their story. It got really obvious, really fast in the example above that after the first couple of best sellers, there was a ton more money to be made. So the story kept getting expanded, and bigger roles for previously bit characters, and subplots and so forth. So the fascination for the setting, characters, or the story kept getting buried in more layers until you just stopped caring at all.
While brings me to a last peeve, where you write your BFMNS, and get the awards and attention, and it maybe gets to your head or heart, and that next novel, well, you have conventions to do, and blogs to write, and mech to sell, so it ends up late, maybe a few years, maybe more than a few. And then there’s that next book, and wow, it’s been now 10 years since you wrote the first, and 7 since the second, and how time flies and wait I’m invested in this new project… NO, the author has no contractual obligation with me to finish the story, but it doesn’t mean I (and the other fans) are not disappointed. And it almost retroactively ruins the books I enjoyed previously.
A friend of mine, who has similar issues instituted a ‘no incomplete series’ rule for himself. If the series wasn’t finished, he wasn’t reading it, as a direct result of Rothfuss’s Name of the Wind novel and the the issue laid out above. I have considered it many a time…