Rather than safer route, I would guess its more known vs unknown. Afrezza has not been shown to be unsafe.
The dosing difference is the other obstacle. With my pump, I rarely bolus more than 3-4 units for meals. But for higher carb meals, will bolus 1-2 units pump, in addition to 4 unit Afrezza. I have 8 unit Afrezza that I usually split, but on occasion use full 8 when have fast rising BG, with higher carbs “food on board”. Without CGMS, I would not be as aggressive with Afrezza.
It is not covered by my insurance, also obstacle for more usage. But signed up for lower cost program offered this year, but will likely stop once that program ends.