By the way, do people actually think the singleplayer won't be anything big just because they said you can use it as a tutorial? Did you not see the cutscenes they showed? Did you not see the octo expansion-like levels? It's going to be a whole experience.
Besides comments coming from people who just don't play Splatoon, it seems like some have just forgotten what the other two story modes were like, because Splatoon 3's clearly has a lot more going on. The premise of Hero Mode in 1 is "the Octarians are up to no good." In 2 it's "Callie has been kidnapped." There's really nothing more to them than that. Just from the glimpses we've gotten of the new mode in 3, the plot involves some or all of the following: the return of mammals to the world and the mysterious goop everywhere (with the mode being called Return of the Mammalians instead of just Hero Mode again),
and something's going on with Salmonids that's led you to team up with what's normally an enemy you fight; Callie/Marie/Cuttlefish/Agent 3 are there
and so are Shiver/Frye/Big Man, Octavio is there but he might be an ally, and something happens that causes your own character's appearance to change between the Hero costume and the obviously chaos/apocalypse-based look. There's the motif of the rocket in the hub area and a voice doing a launch countdown in the background. There's the potential to elaborate on things that were part of the Octo Expansion. There are cutscenes, something the previous base games didn't have. As far as the actual content goes, it's going to be a mix of longer traditional levels and shorter challenge levels inspired by the Octo Expansion, but there are also some new things, like the snippet of a level we saw with the more cinematic camera. And finally, there are elements we know will be there, but they haven't even shown a hint of yet, like bosses and "bot" enemies, so we don't know how they've been changed.
Despite all that, will this live up to some people's expectations? Apparently not. But the story mode is still not the point of the game and never will be, and that's the sole reason it's not focused on as much in the trailers (in addition to saving some surprises in terms of the levels and obviously the plot). Compared to Splatoon 2, which has essentially the same story mode as the first game with a couple new level gimmicks, this game's has clearly evolved both in presentation/plot and in gameplay, and it will likely end up as a clear marriage between the structure of Hero Mode and the creativity of Octo Expansion, which is exactly what I wanted. And I think most players, who weren't biasing themselves from the get-go with these "marketing strategy-based takes" we're seeing a lot, are going to end up praising it as such.