There are plenty of reasons why you'd want the same app running twice on your phone. Prior to Facebook Messenger or Instagram adding multiple account support, many users had resorted to downloading modded APKs of the apps to be able to log in with different usernames on the same device. But many other apps still don't allow you to use multiple accounts simultaneously, like Facebook and Skype for example. There are also other reasons why you'd want another instance of an app: if you just want to test something without breaking the main app, if you want to have two different progresses of the same game, if a watchface application only allows one setting and you want an easy way to switch without fiddling with the preferences each time, and so on.

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