On the other hand, fresh air, exercise, and natural sunlight can only be beneficial. I feel it's a trade-off. It is stressful for the snake, there are some risks of exposure to bugs (not a huge risk), and you must be extremely careful with supervision.
I think, overall, it's neutral--the benefits and risks are likely balanced. A lot depends on how YOUR individual snake responds to it. They are all individuals. I would not take a snake with a shy or nervous disposition outside.
