...Most of the popular apps like Instagram, YouTube, Spotify, etc. use a Single Activity with a bottom bar and control multiple fragments in that single activity. It was always hard to manage fragment managers in our application. We are using a bottom bar and the user has his history in every bottom bar tab. For instance, In the Home tab, the user can go 4-5 fragments deep in the Home tab. Then user switches to another tab and goes 3-4 fragments in that tab too. It is not confusing anymore. Medusa keeps track of the fragment history of every tab and you only call start, and goBack to navigate your fragments.