Disney/Marvel: They were pushing Peter as the future leader of the Avengers and he is literally Tony's legacy.
Sony: The most profitable Spider-Man movies they made are fully set in the MCU, the last one ended with a big as fuck cliffhanger and Spidey is 100% dependant on Stark Technology and Gadgets. They can't suddently make a movie cutting every kind of link with Stark or the Avengers.
-actually, Far From Home made it clear Peter needed to find his own path, NOT Tony's, Happy clarified as much. And I don't see how it is was pushing him as leader, clearly Endgame set up Sam to lead the team, and for other alternatives IIRC in the comics T'Challa and Carol have led the team but never Peter. Plus, Peter is like what, 17 now? It'd look ridiculous even when he reaches adulthood for him to be leading the others based on age difference and especially since Sam and Carol are former military and T'Challa is a KING, kinda dumb for Peter to call the shots when faced against such seasoned experience. Regardless, Endgame is clearly the more impactful film for the MCU as a whole so I'm pretty confident we'll see Sam suit up as Cap and lead the new Avengers team in Phase 5 as long as the actor's willing to return
I could see Peter leading a separate Avengers team consisting of other teens though like Kate Bishop and Kamala Khan. If that's what you meant all along, my bad.
Peter is kind of a genius himself, he can easily get by just fine without Stark's gadgets, he did so for decades in the comics. Again, Happy's talk with him in Far From Home seemed to indicate that (thankfully) Peter will forge his own hero path not defined by Tony's legacy
-actually, Spider-man 3 outgrossed Homecoming by $10 million. And Venom only made $24 million less than Homecoming. Not that I don't want Holland's Peter to remain in the MCU, but just pointing that out