Victoria Alonzo also points out, in one of the special features attached to the Captain Marvel Blu-ray, that doing the de-aging right on Samuel L. Jackson was especially important. Jackson was already a movie star throughout the 1990s, the era in which Captain Marvel takes place, which means we all know exactly what he looked like back then. A less than accurate de-aging job on an unknown face might work out fine, but if post-production doesn’t get Jackson’s face right, we all know it.
Article source: https://www.cinemablend.com/news/2474515/captain-marvel-had-to-de-age-samuel-ljackson-in-a-huge-number-of-shots