These guys don’t understand that the speed of reading is dictated by THEM; if it takes you only 5 seconds to get through the 20 pages of the chapter, calm down, dude. Nobody is chasing you.
Besides, a manga/comic is not like a movie/series where the pace of “playback” is constant regardless of whether there is dialogue or not in the scene. A scene in a movie is going to last, say, 5 minutes with or without the dialogues, if it’s action or contemplative. In a comic book it’s obviously going to take longer to read a page with dialogue than one without. Worse still if it’s a two-page general shot with no dialogue, if you don’t go into every detail of the scene, you’ll see it for half a second and move on.
If you feel dissatisfied with how fast you read a comic book… Boy, it’s your fault.
Manga Plus is the official App where Shonnen Jump digitally publishes its manga, from there manga like Chainsaw Man, Spy X Family and Dandadan, among others, became famous.
The comments are not so much complaints as (very) recurrent jokes, but in my land they say that “between jokes, the truth comes out”. That said, complaining about the lack of content in a weekly manga of no more than 24 pages per chapter is like complaining that a non marvel or DC movie has no post-credits scene, sequels or prequels. And if it bothers them so much to wait one to two weeks for a chapter they feel is “short”, they can always wait for the compilation volumes to be published and read the whole thing in one sitting.