Diabetes is a disease that needs its symptoms to be monitored and managed at a high granularity. Both monitoring and managing blood glucose can be really invasive though, with needles and finger-sticks causing extensive scar tissue development. Minimally invasive glucose monitoring technology that generates high-resolution time series data (such as Dexcom systems) literally transforms the way that people can manage their disease. Going from glucose reading every 6 hours (test strips) to every 5 minutes (CGM) is life changing. Monitoring that is non-invasive is the next technological step.
The holy grail for treating diabetes should actually be stabilized monomeric human insulin. Afrezza[0] is exactly that, and inhalable no less. The company that makes it just can't break through the insulin cartels and insurance-pharma exclusivity, so they are having a hard time. They did what was unachievable for 100 years though, and they are amazing chemists.