Board Thread:Episode Discussions/@comment-1181222-20170802095306/@comment-2112031-20170807115710

Starscream1998 wrote: Who cares about animating chapter 700, at this point it would just be silly as the story has expanded way past that chapter. While somewhat true, many of us would still have liked to have seen the story animated, given that it was the finale of Naruto: Shippuden.

Not to mention the fact that the anime is going to start adapting Scarlet Spring (which was also known as Chapter 700+1-10) next episode. The creators have already stated that they're trying to stretch for time in order to allow the manga story to advance further, so why not just adapt everything in chronological order? It seems like the logical thing to do.