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 w

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.