Agreed, this has been my biggest frustration with the notch. I missed calls the first few weeks I had my iPhone X, and finally changed Do Not Disturb to be on a schedule rather than manually set.

I wish they had provided the option to customize the status bar to always include this icon. Or better yet, create a mode where Do Not Disturb automatically turns on and off when I'm sleeping and awake based on signals like alarms, charging, and motion.