Simply the must to have!!!!!!!!!!!!

This is a must.

Since I've upvoted but there are no description why this feature is requested I feel obligated to describe my usecases.

After login I want to discard all routes and components which are not needed anymore. SwitchNavigation is elegant solution but it lacks animations between scenes. Would it be possible to animate between SwitchNavigation scenes in the future?

Another case: User starts a survey, finishes all the steps, and goes back to starting scene. I'm currently resetting my route stack since I don't want to keep any of those routes in memory any longer (big images etc.).