I disagree with everything you say regarding the storytelling in anime and manga. To start, this is what I perceive is bad about the story telling generally (i.e. the disadvantages of anime/manga):
1. Too much filler. The excessive filler definitely distracts the reader/viewer from the main plot and dilutes the intensity that it may be trying to build up.
2. Most anime/manga stories have too much comedic relief which makes it hard to take the characters seriously and ultimately the plot seriously.
3. Over-dramatization which includes unrealistic responses a character would have to an event that can disengage the viewer. (Viewers/readers are most immersed when they can relate to the person and/or scenario.)
4. Plot armor from HELL. ‘Just makes anyone who’s not an anime/manga fanatic give zero shits about the protagonist.
Of course there are exceptions. I haven’t watched what I consider to be a serious anime in a long time to give a strong example, but out of memory, I remember Princess Mononoke and Devil Man sticking to their story lines without there being too many unrelated side events and character kookiness.
———————-
Here’s a few to add about western comics/animation. Maybe I’ll add a few more later when I think of them. I primarily just wanted to respond to your own thoughts. You obviously don’t like Western mediums and that’s jolly.
Advantages:
1. Variety in art styles.
2. Wide variety of story themes and archs to choose from.
3. Includes “Superb Storytelling, Concepts, Artwork, Worldbuilding, etc.”
Disadvantages:
1. Unbalanced marketing of distributers. (There are too many great underground western comics that should be more well known.)
2. Over-inflation of the superhero genre (there’s much more to look at in these mediums other than a guy/gal in a cape).