I already acknowledged Pharrell be on some bullshyt as well. I do think some of it has to do with him being on the reference track and the artist deciding, "fukk it, leave him on." Even when he's replaced on a hook you can still sometimes hear him underneath the singing. Like on "Come Close" or even "Milkshake" (

), Pharrell is underneath the vocals laid on the final versions. Just a theory.
Regardless, he and Swizz do not occupy the same space. This man launched the solo careers of Justin Timberlake and Gwen Stefani. Straight up launched the careers of Clipse, Slim Thug, Kelis etc. Gave Mystikal, Nelly, Fab, Snoop and Jayz some of their biggest hits. Been awarded a producer of the year Grammy, nominated for an Oscar. On the
strength of his hooks. You are tripping and should feel bad for making the comparison.