Warning: Contains spoilers for Bleach: Thousand-Year Blood War part 3, episode #9.Filler is an infamous part of older anime, and few anime were worse about it than Bleach. Not only did they have all the usual problems of excessive length and poor writing, but thanks to how long Bleach’s canon arcs were, the filler arcs would often abruptly force the main story to a pause for months on end, making their already divisive existence even worse to those who watched them.
https://screenrant.com/bleach-thousand-year-blood-war-anime-zanpakuto-rebellion-arc-canon-theory/