I posted about this in the MU worldbuilding thread, but I thought about it more, expanded upon the initial point, and realized I needed to share this with others and see what they think.
I know the complaints have mounted that Spider-Man's mythos in the MCU wasn't represented nearly as much as it could've been, and relied heavily on the shared MCU over the elements Spidey himself could've brought in. I do like MCU Spider-Man, but I can see where it's coming from.
They favored a "wide" look, not a "deep" one. By that, Spidey often hangs out with other heroes, especially Tony Stark, and appeared in crossovers to high-five the other MCU characters. Many of the plot elements actually owe themselves to different parts of the MCU, like Vulture and Mysterio being updated to have been affected by Stark (the former shut down by Damage Control, the latter a Stark employee). Hell, even aspects such as Shocker's gauntlets originating from Crossbones, and the Elementals originating from outside Spidey's rogues while also being related to the ex-Stark employees. Happy Hogan being a prominent supporting character is especially noteworthy. Uncle Ben was also downplayed outside of the implication he existed in favor of Tony Stark.
In fact, let's look at the aspects of the Spidey mythos that were represented:
Spider-Man (Peter Parker)
Aunt May
Midtown High
Vulture
Shocker
Mysterio
"Prowler"
The Daily Bugle (reimagined as an internet channel)
And that's about it. Many blame Marvel for this, trying to promote Iron Man and the MCU and using Spider-Man as the means to do so. Thing is, I think it's the result of working with Sony, not just Marvel themselves. As the saying goes: Don't hate the player, hate the game.
Marvel didn't own the film rights to Spider-Man, it was just loaned. I'm sure we all know this by now. With that, having to answer to Sony came with huge downsides because they constantly had to please them. Sony ultimately had the final word on what could be in, and what couldn't, and you can just imagine how much that hampers creativity. They couldn't actually make any major worldbuilding elements that hinged heavily on Spidey, since Sony could easily revoke it at any moment (which they did), and they couldn't bring in too many Spidey-related characters in, because that would mean losing more in this case which would have ramifications across the MCU.
In a world where Marvel actually had the film rights to Spidey, they could let it flow much more naturally, bring in more elements of Spidey lore, and maybe even make spin-offs for characters like Miles Morales, Black Cat and so on for Disney+, and just make the Spidey part of the MCU feel more like it's own entity. At the same time, the elements of the Spider-Man lore could impact the wider universe. That is not the case. The truth is they couldn't do any of that, and they were cautious to avoid having too much of what they don't own as part of the universe. They were justified in being weary considering the divorce.
Look at the other MCU sub-settings. Just about all of them were allowed to rely primarily on their main mythos. The shared universe elements were smaller, and used to better the experience rather than intrude. You know what they have in common? Marvel owned their film rights and had no restrictions to deal with. If Marvel had full Spider-Man film rights, we could've had a similar deal.
I think the best look at that this could've been like is Spider-Man PS4. The game is set in a world where the rest of Marvel exists, yet still focuses on Spidey's own mythology, characters, plot elements and villains. All are reimagined and distilled for a new take, but true to the source. It's probably what MCU Spider-Man would've been like if Marvel could afford to make it that way. If they did, they could've had the works like Oscorp, Daily Bugle as a wide news source, Symkaria/Silver Sable International, Sinister Six, more Spider-related heroes, more Spidey villains, and who could impact the wider world, more Spidey supporting characters both in the Spider-Man movies and elsewhere... more everything really.
I mean, I think Michelle came about because Sony wouldn't let them use Mary Jane Watson. What does that say? In the end, I can't fully blame Marvel for the lack of Spider-Man's own mythology in the MCU. It would be dumb to integrate them too heavily, when they don't even own it, and couldn't control it. Imagine how bad it would've been if they set up Norman Osborn as an MCU-wide villain as he was rumored to be, only for Sony to pull the plug? Yeah, pretty bad.
Those are my thoughts anyways. If you have anything to add, feel free to do so. Let me know what you think.