A sticky can only be updated by the original poster, while a sidebar can be updated by all of the moderators. For sidebars there's even a diff log so that all o

A sticky can only be updated by the original poster, while a sidebar can be updated by all of the moderators. For sidebars there's even a diff log so that all of the moderators can understand how it's been updated. Most subreddits have multiple moderators, so putting the sidebar in the sticky isn't practical.