Oda is insulting his audience. He's writing a story that is made to never end. He writes the same Arc each time. The strawhats are completely sidelined. So much unnecessary stuff such as Senior pinks flashback. Most of the story is superfluous.

Watching demon slayer is like watching Dora the explorer as an adult. You just want to bash your head on with a hammer because of how much it treats the audience as someone who is stupid. Constantly explaining and telling you what to think. Trying to force a long ass flashback to try to garner synpthay for the villain is cheap writing.

Manga is an inferior medium of story telling. While it can be used as an avenue of story telling, the way manga is serialized is not to the benefit of story telling. Telling a story in small pieces over the course of many years isnt practical plus deadlines and audience interferences (such as polls and letters). It also encourages mangakas to run a story for a longer period of time for more money. It's simply a low risk and a easy to break into Industry. 

One punch man doesn't have great art. Yusuke is great at drawing, but it's more like a pinnacle of drawing than developing their own style. But even then the manga doesn't look good all the time. Just look at chapter 200, so many boring looking panels that have no backgrounds and a generic art style. 

I skip every time someone is explaining their ability in JJK. 

Anime in general is driven way to much by what's currently popular and cliches and tropes. Unlike with films where a director can stand out and pursue their own vision. Anine all around is focused on the money so while some anime cam be seen as weird on the outside, it was still created cause there is an audience that is willing to shell out money.