Board Thread:Boruto Discussions/@comment-33545035-20191208124103/@comment-24824859-20191212190914

Seelentau wrote: See, but that's the problem: The anime precedes the manga content. It's like two straight lines that are just waiting to be connected (which will take place when the anime starts adapting the manga). So if you'd remove the anime, you'd remove content, in our case. So yes, the anime needs to be adapting something for filler to exist. If an anime starts out with adapting something else than the source material and never changes that, it's not filler. If it starts with adapting the source material and then creates new material so that the source material has more content to adapt, the new material is filler.

https://www.quora.com/What-does-a-filler-mean-in-anime

https://www.animefillerlist.com/

And no, I don't have a link to that tweet at hand. It should be somewhere in the Consensus Track board, I posted it. If the removed content doesn't change anything in the overall plot, then it's filler. The anime seems to be pumping out subpar plot-lines to allow to manga (where it takes the more significant plot-lines from) to have enough material to implement. TV shows use filler to give extra time for the more important episodes to be produced.

https://aminoapps.com/c/anime/page/blog/non-canon-vs-filler/mJtk_uBgNKV4jvBJvgqJw3pRo7kYN

Oh, alright