A code smell isn't supposed to be automatically bad. A smell is an indication that something might be wrong. Sometimes using a smelly pattern is legitimately the only way to do something.

Apart from the fact that, as another commenter said, "smells" are not "rules", I think most of these points come down to developing good habits, and ultimately save a lot of time in the long run by initially spending some time thinking about maintainability and preventing/limiting technical debt accumulation.