Not universally. I disagree, they read differently to me, and I'd say them differently.
Parentheses to me always feel like the speaker switching to camera #3 while holding a hand up to their mouth conspiratorially.
Em dashes are same-camera with maybe some kind of gesticulation such as pointing or hands up, palms down, then palms up when terminating the emdash clause.
Parentheses to me always feel like the speaker switching to camera #3 while holding a hand up to their mouth conspiratorially.
Em dashes are same-camera with maybe some kind of gesticulation such as pointing or hands up, palms down, then palms up when terminating the emdash clause.