> the best quality I can reasonably obtain.

Cellphones absolutely can produce high quality results. Especially if you add the constraint "best quality I can reasonably obtain" as many consider carrying a dedicated camera all the time to not be reasonable. And this was the case even before the advent of the smartphone. How many people did you see carrying a camera in 1980, or 1990, or 2000? Almost zero.

The best camera, is the camera you have on you.