flat-field correction in other fields does 2 corrections. a. dark field b. white field

flat-field correction in other fields does 2 corrections.
a. dark field to adjust for uneveness in the pixels dark current,
b. white field to adjust for unevenness in vignetting and external lighting.

This is not allowed for in the Lightroom add-in.

Is this because

a. no cameras need this adjustment

b. It is too much like hard work?