Henry Ford`s statement for his Model T that, "You can have any color you want, as long as its black" has morphed into "The color Black is used on vehicles to kept detailers and car-care product manufacturers in business."
I do believe that the metal flake in some of the black hues does "hide" the inevitable swirls and fine scratches in the clear coat better than a pure black. At least that was/is the marketing idea behind Ford`s Tuxedo Black Metallic used on their SUVs and trucks in response to customer concerns about such "imperfections" being visible in black vehicles.
That has been a detailing concern among professional and hobbyist detailers since this forum began: Do you charge more for detailing the color black?
The consensus is NO, unless it is REALLY bad to begin with and should be charging by the time it takes, and not by the job.
Do I spend more time with black? Depends on how "perfect" I want it. On a daily driver, NO. On someone else`s garage queen/show car, maybe, if they pay me for it. Then again making a bad dark-colored DD vehicle look even somewhat "better" usually has the vehicle owner ecstatic when they see it, until they take it to the high school (whatever club or sport) fund-raiser car wash or have the dealership give it a "complimentary wash".