Yeah, not a mistake, might want to redo your title or identify this as an opinion piece, because as you can see by my comment and the others, players largely disagree with you. There is no such thing as too much side content, as long as it doesn't detract from the main story. And by that, I mean the quality of the main story, not the fact that the side content exists. Here's a tip, just don't do the content! How about that?!