>>2611298The longer the anime is, it likely it will be full of pointless filler rather than actual stories.
Anime used to have much more episodes in the 80s, but throughout the 90s, 00s and 10s shows have been progressively shorter by cutting away most of the filler.
A good chunk of anime that reach between 30-70 episodes can be trimmed down to 12 episodes and maybe another 12 episode season and still get the story across.