I see posts on how to move the "featuring" strings to another tag, but how would I just remove it completely from the artist tag?
It depends ..., if you show us a real world example, then it would be easy to give a concrete answer.
In the meantime you can move the "featuring" part to a tagfield of your wish and in a following step remove this tagfield.
The artist currently looks like
Robotic Pirate Monkey feat. Late Night Radio
Santana Featuring Dave Matthews
I want it to be
Robotic Pirate Monkey
Convert "Tag - Tag"
... or ...
Action "Format value
See also ...
Two $if functions for the title