If mastering is part of the artistic process, why do so many producers have someone else master?

Shouldn't such an integral part of the process be done by the artist? Isn't it better to master yourself?

Submitted September 30, 2016 at 08:17PM by adamwiles https://www.reddit.com/r/edmproduction/comments/55ankg/if_mastering_is_part_of_the_artistic_process_why/?utm_source=ifttt

Javier Rodriguez