Not sure what you mean by "primary" instructors, @ctweney , but since the affected users have an official teaching assignment for the section and automatically get teaching rights in bSpace and Canvas, I think it's the right thing to do.

The interesting question for me is how the My Academics / My Classes UX will feel for instructors who are assigned to many sections of the same course offering, or only to secondary sections. But that question stands with or without this change.