Board Thread:Questions and Answers/@comment-30771283-20170705160821/@comment-1327106-20170706041844

Every artist works at their own pace. GRRM was brought up earlier. He knows his fans are going crazy waiting for the next book, but he doesn't want to release it until he is satisfied with it. A book he puts out sooner, isn't a book he would be happy with, and chances are the reader wouldn't be other.

I suspect that Isayama is working at a pace that is a good for him. If he worked faster, you might not be happy with what came out. Not all artists are created equal, nor are all stories created equal. I suspect Kishimoto does not spent as much time outlining and researching as Isayama does. Naruto takes a "rule of cool" approach (hence flamboyant ninjas in a world with laptop computers) and Isayama's approach is much more measured, along the lines of "given the rules of this world, how would this actually work?"

That's why we know the two different ammuntion types and what the reload time is on a Wall-mounted cannon despite the fact they're incredibly ineffective against Titans. These are small details that a reader is likely to gloss over and forget, but he probably wanted to be realistic and read up on real world cannons. That takes time.

Naruto is a fun series and its "everything and the kitchen sink approach" works, but it's not the same kind of series so I don't think can compare the production style of the two.