Exactly. Your whole post was on point.
I'm getting tired of the "Well, they have to find new origins to distance themselves from Tasm2" and "You wanted Spidey in the MCU and now you're complaining?!" arguments.
If Marvel 
really wanted to make something new and different, they whould have made a Miles movie with Miles as the main Spider-man. But he wouldn't have made enough money, so instead they brough Peter and changed him too much 

. 
I would have been fine with Tony showing at the very end of the movie and be like "Peter you impressed me with Vulture out there, I might need you with something new now." dun dun dun, Infinity War. 
I would rather have the hero being on his own in their solo movie and then teaming up in the Avengers movies. I thought that was the purpose of those movies.  Now the interactions of the different heroes in the Avengers movies don't feel special because they are already teaming up in the other movies.
And the fact that I can't stand Tony in the mcu and that he's everywhere is not helping 

.
I definitely think Tony is going to be in the Homecoming sequel because the first one is going to reach the billion and Marvel is going to want the repeat that success.