I have a natural light studio too, the ceiling is all diffused sky lights, and the illumination is a delicious combination of soft and bright BUT.....
Light level changes with the hour of the day and passing clouds.
Illumination still obeys something like the inverse square law; heads are bright, feet are dark.
I have lots of backdrops and reflectors but still not enought to exploit every nuance of light.
The place is roasting hot in summer, chilly in winter.
And I'm truly glad I own it!