Because spiderman is always having realistic tones in book, but its never been believable trying to be a mature setting with adult aimed natural progression("To me at least,, because suspension of disbelief always gets in the way when spidey brings superhero stuff to regular people like mj and Jonah who are comic else civilian that are always put in danger and just unnaturally accepts being in a the most ridiculous situations a superhero does regularly plus they are as unrealisticlhuman as the hero and just as eccentric"). It's pretty standard fictional hero stuff with a protagonist that has to stay a natural force of good and acts like a cheesy cartoon that has to save the day and stay predictable in their unrealistic nature of being marketed as a little morally ethical symbol.
I look at Logan, Deadpool, and Star Lord and the one thing they have over spiderman is being free to be objectively human and adult. There part of the world and or cosmos is depicted as the foundation of their humanity as more than a predefined criteria of good.
Spiderman has no real life adult aspirations for the hero or the world. Peter is always doing something good and acts like a fictional idea of a human than a real human. Peter and his cast represent unrealistic expectations of just repeated moral messages and no straight to the point mature moments.
All the edgy stuff in spidey is still a cheesy concept of comicbook logic, while in deadpool and punisher ther main leads bleed and kill like grey moral humans do to win. Deadpool(And Wolverine, Daredevil, even Venom) swears, lies, mostly takes advantage of sexual situations, kills for good reasons, and end has to stay self content of his situation in order to overcome any hassles he goes through. Compare that to spiderman who recycles his basic all ages methods every new arc showing no realistic growth even when he does his share of character progress like marriage and being accepted by more heroes.
Spiderman having comicbook logic and problems are the real reason He'll never be treated as a legit mature focused hero, he just had to many goofy cringe moments and even more try hard edgy action and drama asociated with his character. A freaking magic spider and devil deal is typical story tropes to tell a typical spiderman story taken seriously.
Seriously peter got molested and got to see a diagnosed kid die being his fan, his world view should not be as uplifting as it is.