Thank you for the response. I could have written the same article in 2013 when I sensed snapchat was first blowing up and people would have had an even harder time with it then. It is interesting to see people now consider this confirmation bias. In the early days there were several parts of Snapchat’s UI that required new learning — swipe as navigation instead of buttons and taps along the bottom, press and hold to take video instead of a mode changer switch, and press and hold to watch instead of just a tap. If someone explored through touch they discovered these, but if not it was hard to learn. What I observed then talking to the early adopters of snapchat was a profound change in how the product spread — people talked about it. I see many more attempts at this kind of design now — imessage heavily uses Force Touch for new gestures and ways to send messages. Tinder uses swipes for its core product. Whether or not there is training built into the product these are all new affordances that need to be learned. I do believe design is changing with touch and gesture as primary interactions and as mobile natives grow up, this will all become even more expected and intuitive. Voice design such as with Amazon Echo is another new frontier and requires a lot of training and learning and examples from others. The key to me on this type of design though is how “rememberable” it is once someone shows you the first time.