Because one, they run longer than they should, and B, power inflation is an easy crutch.

And DBZ wrote the book both of those.

>>139989293
Because what's popular isn't defined by what's good

>>139989293
Editorial meddling, mostly.

>read Yu Yu Hakusho's first couple chapters
>think it's gonna be a fun manga where some dead dude indirectly helps people
>he gets revived
>turns into battle shounen

Dropped it when the manlet and red faggot joined the group.

Power creep mostly. That and pressure to extend the series as much as possible.

>>139991286
Chapter Black is amazing in the manga. It's like the predecessor of HxH, with a lot of different abilities and interesting characters.

>>139990681
Mostly this, fire, ice, time, plants, air, teleportation, unique abilities, etc. Most villans need to be able to resist them all. If the main cast has unique powers, and instead of giving him a hundred powers to resist a hundred powers, they just flat out go. "He's just that strong, that they don't even matter."

Because they're written by hacks who quickly run out of ideas

>Bleach is a cool story about a guy who fights Hollows and solves people's problems
>Turns into a clusterfuck

>>139992211
Bleach is Yu Yu Hakusho's poor man mixed with Tite's fanboyism toward Saint Seiya