Configuration is usually very minimal. It might be as little as nothing to editing 2 lines in a single config file. It depends on what you want to do of course

Configuration is usually very minimal. It might be as little as nothing to editing 2 lines in a single config file. It depends on what you want to do of course. A lot of the following behind devise is due to how well it deals with all of the ceremony involved with standard authentication. Everything from sending out e-mails, password resetting, failed login constraints and all of that stuff. It's nice to be able to hook in a gem and perform minor configuration to get all of that with no fuss. In your example of only having to auth with github then yeah, I wouldn't use devise either because it's so basic. Omniauth is what I would use in that case. I would see that as a toy example too because more often than not you'll want much more than just auth'ing through a third party site.