Like I said, Kishi trash. Naruto was a product of years of creation prior to ever making so it was much more of a refined and well told story and development (minus Naruto himself). Its like a story he started writing when he was a kid and finally got to make it as an adult. But with Shippuden, like you said he started off with so much that could wrapped up and potentially fulfilled stories but he got lost in the sauce, wrote himself into a corner and really didnt know what to do with it. Bullshyt ensued.
