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There are benefits to switching the root view controller, although the transition options are limited to those supported by UIViewAnimationOptions, so depending on how you wish to transition between flows might mean you have to implement a custom transition - which can be cumbersome. You can show t...

In the most straightforward implementation, the Onboarding flow can simply be presented in a modal context, since semantically the User is on a single journey. [Apple Human Interface Guidelines – Modality][1]: Consider creating a modal context only when it’s critical to get someone’s attention, ...