So far I’ve only used it while I’m walking with my coffee in one hand - i use siri voice command to start workout walk and double pinch gesture to hit start.
I see myself using it to dismiss things while driving or dismissing reminders. I struggle to get it to work if im not sotting or standing upright.
I haven’t used single arm to its fullest extent but have a great deal of success with using Siri voice commands to open apps and using the double tap to cycle through menus and start functions