Let’s face it, observing user behaviors and remembering everything they did or didn’t do is difficult. The more time that has elapsed between the test session and when you surface the results the more likely that details will start to get muddier or your own bias will start to enter the picture. That’s where tools like Camtasia and other video recording apps are great for evaluating and disseminating the results of user testing.
A computer in a controlled environment or mobile recording on Android has been available for a long time.
The UX testing problem is that Apple (for security reasons) has disabled the ability to record the screen and interactions of its users on iPhone and iPads.
These screens are smaller and getting close enough to the test subject to see what they are doing is uncomfortable for the person being tested and adds to their anxiety.