...I always laugh when people accuse "natural light photographers" as not really knowing photography...
A good photographer understands light. Period. He/she knows when
ambient light alone is sufficient, when reflectors, diffusers and scrims are necessary, and when full-on strobed light is necessary. With one exception, every self-proclaimed "natural light" photographer I've known has been: (1) Someone who doesn't understand how to effectively use supplemental light to enhance their images and tries to excuse that ignorance by decrying it; and (2) someone who doesn't realize that there is no such thing as artificial light. Artificial light sources? Yes, but a photon is a photon is a photon... They attach some sort mystique to strobed light and feel that it makes things look bad.