You know the thing about being an editor in comics seems to be very different then being a editor for a book publisher. Comic editors usually come from inside the business, usually they're writers themselves, and in a lot of cases they don't want to give up the creative end of it and want some control over what's going to happen. It gets worse the higher up you are because you want to build the universe the way you see it. I've seen several incidents of this nature here in the states and outside in other countries.
The thing is, the editors role is to push the best out of the writer and the artist. They're supposed to guide the best stories, and help the character grow. Serials have to have growth in them or else they become static. It might take years (see comic strips) or weeks (manga weeklies) to get to that point, but still it's important for that character to change. I think the main thing with Spider-man is that the editorials figure that if they keep him static they can always use him for marketing, the problem is that, it makes for a boring character. It's one of the reasons why some kids shows go off the air, because kids don't want to see a character that doesn't grow or change. They need the character to mature.