I think what they are saying is not that you can't type without looking at the screen, is that you can't use a touchscreen without glancing it at some time. For

I think what they are saying is not that you can't type without looking at the screen, is that you can't use a touchscreen without glancing it at some time. For example: is the keyboard up? are you on the right app? did you by any chance dismissed the keyboard or is there a modal? You can't infer this type of interaction without looking at the screen. Touching on glass gives you no feedback. As an anecdote, I have a galaxy note 4 here as my daily driver. The battery has been replaced but still, it doesn't last long. I want my phone to last at least until I get back home, so I decided to change some habits. When I commute to the university, I used spotify to listen to an offline playlist. I decided that listening to music with the smartphone could be replaced with a secondary device. I have a fondness for old minidisc format, so I found my old MD player (a sony mz-r700), recorded my playlists there and started using that while walking. That player has a remote full of buttons, real buttons to control basically all aspects of music playing, from navigation, to volume to anything. With my phone, I would often press play before leaving my building and not interact with it anymore. With the MD player and the remote, I can fiddle with all the controls without ever looking at the player in my pocket or the remote itself. In the end, I use my player features much more than I used the smartphone. I am not only a happier listener but it saves me phone battery. In conclusion, tactic feedback that allows you to do stuff without requiring visual attention removes friction and encourages interaction. As an exercise to those that find this information disagreable, try typing a novel on a Yoga Book without looking at the screen, it is quite hard. Doing the same on a thinkpad is still hard but it is easier than the yoga book option.