I agree with all of that however I do think that people being annoyed by the Quicksilver stuff is justified.
They could have hired any random actor in Hollywood to be Fake Pietro yet they chose the guy who plays the role in the X-Men movies. That was always going to make people jump to the conclusion that this meant something more than just a wink and a nod casting decision.
They knew exactly what they were doing when they made that casting. Anybody who says otherwise is a lie.
Marvel knew that it would drive theories and viewership to see what would come from it.