Galio already now has so many weaknesses. His E, by far, has barely any use as a dash remaining, especially since he dashes backwards first before dashing forwards. Simply allowing him to jump walls with it might make him significantly more fun and useful to play. As it stands, if he so much as barely clips terrain his dash stops, and that makes him much more limited and bad than otherwise.
Edit: didn’t mean to write “again” in title.