I personally think if something needs a walkthrough maybe its time to redesign the interaction. It generally means the app is over-designed, i.e. instead of solving the problem, we are trying to delight the user more.
Ofcourse delighting the user is must, but it should come through better usability and interaction first, and then through UI. I feel by adding walkthrough we try to make user feel that its rocket science, when it really should not be.
Mailbox app gestures originated from app… Clear. Mailbox guys took it one step further. I loved the app at first look and kept it on my home screen but few weeks later, It was clearly failing to satisfy my needs as being ToDo app, I am back to default reminder app, and Clear app is not there on my iPhone anymore. Maybe being a developer, I was amazed with quality and process with which they executed the app, respect for that was the main reason for me to keep that app on home-screen. But it didn’t last long.
