Heatmaps highlight elements of UI most often used by audience of the mobile app.
Rage taps show that some elements don't work or users try to interact with parts of interface created for decoration.
As far as UI issues — one of the most common reasons for leaving or even uninstall mobile app, heatmaps seems to be indispensable tool for churn analysis.
Video recordings of visits allow to see what users do in your mobile app.
Video recordings help:
List of user actions
The most detailed visualisation of app usage that shows every action of specific user in your mobile app. Its like raw data for your insights that you can use from the box without any code.
As a bonus its greatly suits to checking your event settings.
Emphasize steps, where users intermit checkout and close mobile app. These steps or screens are most commonly create bottlenecks and reduce conversion rate in your product.
Only closed funnels allow to check real conversion rate of specific step in checkout process and find real points for your product growth.